Taking into account the reaction stoichiometry, 30.28 grams of Hg are formed using 2.7 grams of mercury (II) oxide.
Reaction stoichiometryThe balanced reaction is:
2 HgO → 2 Hg + O₂
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
HgO: 2 molesHg: 2 molesO₂: 1 moleThe molar mass of the compounds is:
HgO: 216.59 g/moleHg: 200.59 g/moleO₂: 32 g/moleBy reaction stoichiometry, the following mass quantities of each compound participate in the reaction:
HgO: 2 moles ×216.59 g/mole= 433.18 gramsHg: 2 moles ×200.59 g/mole= 401.18 gramsO₂: 1 mole ×32 g/mole= 32 gramsMass of H₂O formedThe following rule of three can be applied: if by reaction stoichiometry 433.18 grams of HgO form 401.18 grams of Hg, 32.7 grams of HgO form how much mass of Hg?
mass of Hg= (32.7 grams of HgO×401.18 grams of Hg)÷433.18 grams of HgO
mass of Hg= 30.28 grams
Finally, 30.28 grams of Hg are formed.
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Consider the schematic nanostructure depicted below.
Which of the following statements is FALSE regarding this schematic structure?
(Do not extrapolate the field of view. Consider only what you are shown)
.
DO 0000
0
A) One of the phases present features interstitial impurities.
B) The microstructure features exactly two components and two different phases.
C) One grain boundary is depicted.
D) Only one phase boundary is depicted.
E) Each of the phases features a similar concentration of vacancies.
The microstructure features exactly two components and two different phases in the given nanostructure. Therefore, the correct option is option B.
What is phase diagram?Within physical chemistry, engineering, mining, as well as materials science, a phase diagram is a specific kind of diagram that displays the parameters at which thermodynamically different phases arise and coexist at equilibrium.
Lines of equilibrium, also known as phase boundaries, or circumstances under which different phases may coexist at equilibrium, are typical elements of a phase diagram. The microstructure features exactly two components and two different phases in the given nanostructure.
Therefore, the correct option is option B.
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Decompression sickness happens when divers return to the surface too quickly, and nitrogen bubbles form in the bloodstream. Apply Henry’s law to sketch a model that can explain how nitrogen bubbles could form during a rapid ascent from depth.
Henry’s law states that the amount of a gas that dissolves in a solution is proportional to the pressure of the gas.
What is Henry’s law?Henry's law is a gas law that states that the amount of a given gas that will dissolve in a given type and volume of liquid is directly proportional to the partial pressure of that gas above the liquid. The law was named after chemist William Henry, who first proposed it in 1803. Henry's law is expressed mathematically as: P = kH x c, where P is the partial pressure of the gas, kH is the Henry's law constant, and c is the concentration of the gas in the liquid. This law is applicable to gases that are relatively insoluble in liquids, such as nitrogen, oxygen, and carbon dioxide.
As the diver ascends to the surface, the pressure on the nitrogen gas decreases rapidly which results in an increased amount of gas being released from the solution. This release of nitrogen gas forms bubbles in the diver’s bloodstream, leading to decompression sickness.
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A student attempts to identify an unknown compound by the method used in this experiment. She finds that when she heated a sample weighing 0.5032 g the mass barely changed, dropping to 0.3176 g. When the product was converted to chloride, the mass went up, to 0.3502 g. a. Is the sample carbonate? b. What are the two compounds that might be in the unknown?
Answer:
a. To determine if the sample is a carbonate, we need to calculate the theoretical mass loss if the sample were to completely decompose. Carbonates decompose to form the metal oxide and carbon dioxide:
MCO3(s) → MO(s) + CO2(g)
where M is the metal.
The molar mass of CO2 is 44.01 g/mol. The molecular weight of MCO3 is the atomic weight of the metal plus the atomic weight of carbon and 3 times the atomic weight of oxygen. We don't know the identity of the metal in this case, so we can't calculate the exact molecular weight. However, we can use the fact that the mass barely changed upon heating to assume that the mass loss is due to the release of a small amount of CO2, and assume that the rest of the compound remained unchanged. From the data given, the mass loss upon heating is:
0.5032 g - 0.3176 g = 0.1856 g
Assuming that all of this mass loss is due to CO2, we can calculate the theoretical mass loss for a carbonate with a molecular weight of MCO3 as:
(44.01 g/mol) / (MCO3 molecular weight) = 0.1856 g / 0.5032 g/mol
Solving for the molecular weight of MCO3, we get:
MCO3 molecular weight = 168.2 g/mol
This corresponds to the molecular weight of calcium carbonate (CaCO3). Therefore, the sample is likely to be calcium carbonate.
b. If the sample is not a carbonate, then it must be a mixture of two compounds, one of which decomposes upon heating and the other does not. Let's call these compounds A and B, where A is the compound that decomposes upon heating. We can set up a system of equations based on the mass changes:
0.5032 g → 0.3176 g (heating, compound A decomposes)
0.3176 g + x → 0.3502 g (conversion to chloride, compound B forms)
where x is the mass of compound B formed. Solving for x, we get:
x = 0.3502 g - 0.3176 g = 0.0326 g
This means that the mass of compound A before heating is:
0.5032 g - 0.1856 g = 0.3176 g
The mass of compound B before conversion to chloride is:
0.3176 g - 0.0326 g = 0.2850 g
We don't know the identity of compounds A and B, but we can calculate their percentage composition based on their mass and the total mass of the sample (0.5032 g):
% A = (0.3176 g / 0.5032 g) x 100% = 63.06%
% B = (0.2850 g / 0.5032 g) x 100% = 56.61%
These percentages add up to more than 100%, which means that there was likely some measurement error. It is also possible that the two compounds are not pure substances, but mixtures of different compounds. Without more information, we cannot determine the identity of compounds A and B.
3 Below is a heating curve for a pure substance. It shows how the temperature rises over time, when the substance is heated until it melts, then boils. Temperature / °C 115- 17 solid liquid gas Time a What is the melting point of the substance? b What happens to the temperature while the substance changes state? c The graph shows that the substance takes longer to boil than to melt. Suggest a reason for this. d How can you tell that the substance is not water? f Sketch a rough heating curve for pure water.
The substance's melting point is 15 °C. A heating curve is a plot as well as graph in which a substance is heated up over time.
What is heating curve?A heating curve is a plot as well as graph in which a substance is heated up over time to determine how much energy it absorbs and how its condition changes as the temperature rises.
(A) The material is in a solid state at point A.
At B, the material has begun to dissolve. It occurs in both solid and liquid forms.
Point C: The material is liquid at this time.
Point D: The stuff has already begun to boil. Both the liquid and gaseous forms of it exist.
(b) The substance's melting point is 15 °C.
(c) The substance's boiling point is 110 °C.
(d) The temperature doesn't change while the state changes.
(e) If the material had been water, it should have had a melting point of 0°C and a boiling point of 100°C. Thus, it is not water.
Therefore, the substance's melting point is 15 °C.
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3. complete the chart with characteristics of mineral resources. nonmetallic minerals metallic minerals ferrous alloys nonferrous alloys
The chart with characteristics of mineral resources has been attached below.
What is lusture?Luster, also spelled as "lustre", is the visual appearance of a mineral surface when it reflects light. It is a physical property that describes how shiny or dull the surface of a mineral appears. Luster is determined by the way in which light is reflected from the surface of the mineral, and can be described as metallic (like the shine of a metal), vitreous (like the shine of glass), pearly (like the shine of pearls), greasy, dull, or earthy. The luster of a mineral can provide clues about its identity, as different minerals have characteristic lusters that can help distinguish them from one another.
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select all of those molecules from the list that are examples of lipids. multiple select question. a. oils b. cholesterol c. dna d. phospholipids e. glycogen
All of the lipid compounds are soluble in organic solvents but not in water. Among the given examples, the lipids are oils, cholesterol and phospholipids. The correct options are A, B and D.
What are lipids?The organic compounds which consists of carbon, hydrogen and oxygen atoms and they form the framework for the structure and function of living organisms are called lipids.
These compounds are non-polar molecules which are soluble only in non-polar solvents and it is insoluble in water. They are composed of fats and oils. They are energy rich molecules which provide energy to perform different processes.
Thus the correct options are A, B and D.
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based on the calibration CURVE SHOWN BELOW WHAT IS THE CONCENTRATION OF SOLUTION...
The calibration curve shows that at an absorbance of 0.35, the concentration of phenol red is approximately 11 μM. Therefore, the concentration of the solution being analyzed is approximately 11 μM or 0.011 mM (millimoles per liter).
What is concentration?Concentration refers to the amount of a substance (solute) present in a given volume or mass of a solution (solvent). It is typically expressed as moles of solute per liter of solution (mol/L), or as a percentage or fraction of the total solution. There are different ways to measure concentration, depending on the nature of the substance and the application. For example, molarity is a commonly used unit of concentration in chemistry, which represents the number of moles of solute per liter of solution. Other units include molality (moles of solute per kilogram of solvent), percent by mass (mass of solute per 100 units of mass of solution), and parts per million (ppm), which represents the number of units of solute per million units of solution.
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write the net ionic equation for the reaction of zinc metal with aqueous copper(ii) nitrate. include physical states.
The net ionic equation for the reaction would be: Zn(s) + Cu(NO3)2(aq) → Cu(s) + Zn(NO3)2(aq)
Netw ionic equationIn this reaction, zinc metal (Zn) reacts with aqueous copper(II) nitrate (Cu(NO3)2) to form solid copper (Cu) and aqueous zinc nitrate (Zn(NO3)2).
Zn(s) + Cu(NO3)2(aq) → Cu(s) + Zn(NO3)2(aq)
To write the net ionic equation, we need to remove the spectator ions (ions that do not participate in the reaction and remain unchanged).
The complete ionic equation is:
Zn(s) + Cu2+(aq) + 2NO3-(aq) → Cu(s) + Zn2+(aq) + 2NO3-(aq)
The spectator ions are the two nitrate ions (NO3-), which appear on both sides of the equation. Therefore, we can eliminate them from the equation to obtain the net ionic equation:
Zn(s) + Cu2+(aq) → Cu(s) + Zn2+(aq)
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step 1: identify the molecular ion. first let's go over several mass spectrometry basics you will need to know in order to solve a mass spectrum. a. the original molecule that has lost an electron is called the . b. during fragmentation, what is generated? c. the largest peak in a mass spectrum is called the d. peaks observed on a mass spectrum are e. the molecular ion is .
The molecular ion by letting go over several mass spectrometry basics are:
a. the original molecule that has lost an electron is called the parent ion.
b. during fragmentation, fragment ions are generated.
c. the largest peak in a mass spectrum is called the base peak.
d. peaks observed on a mass spectrum are mass-to-charge ratio (m/z) values plotted against their respective intensities.
e. the molecular ion is the peak corresponding to the intact parent ion, which represents the molecular weight of the original compound.
What are the molecular ion?The peak in the mass spectrum that represents the entire parent molecule (or molecular ion) of the substance under investigation is known as the molecular ion peak.
This peak serves as a marker for the original compound's molecular weight and provides information about its chemical formula. During the ionisation process, an electron from the parent molecule is taken out to create the molecular ion.
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what is the volume of 10.0 moles of Nn2 gas at STP
The volume of 10.0 moles of N₂ gas at STP is 224.0 L.
What is STP?
STP stands for "Standard Temperature and Pressure". It is a set of standard conditions used in chemistry and physics for measuring and comparing properties of gases. The standard temperature used in STP is 0 degrees Celsius (273.15 Kelvin), and the standard pressure is 1 atmosphere (101.325 kPa or 760 mmHg).
At standard temperature and pressure (STP), the temperature is 273.15 K (0 °C) and the pressure is 1 atmosphere (atm).
To determine the volume of 10.0 moles of N₂ gas at STP, we can use the ideal gas law, which relates the pressure, volume, temperature, and amount of a gas. The ideal gas law is:
PV = nRT
where P is the pressure, V is the volume, n is the amount of gas in moles, R is the gas constant, and T is the temperature in Kelvin.
At STP, the pressure is 1 atm and the temperature is 273.15 K.Substituting these values into the ideal gas law, we get:
V = (nRT) / P
V = (10.0 mol x 0.08206 L atm/(mol K) x 273.15 K) / 1 atm
V = 224.0 L
Therefore, the volume of 10.0 moles of N₂ gas at STP is 224.0 L.
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24 g of magnesium reacts with 38 g of fluorine to produce _____ g magnesium fluoride.
The mass of magnesium fluoride produced when 24 g of magnesium reacts with 38 g of fluorine is approximately 61.5 g.
The balanced chemical equation for the reaction between magnesium and fluorine is:
Mg + F2 → MgF2
According to the equation, one mole of magnesium reacts with one mole of fluorine to produce one mole of magnesium fluoride. The molar mass of magnesium is 24.31 g/mol and the molar mass of fluorine is 18.99 g/mol. Using the given masses, we can calculate the number of moles of each substance:
Number of moles of Mg = [tex]24 g / 24.31 g/mol = 0.988 mol[/tex]
Number of moles of F2 = [tex]38 g / 18.99 g/mol = 2.00 mol[/tex]
Since the reactants are in a 1:1 ratio, we can see that magnesium is the limiting reagent. This means that all of the magnesium will be used up in the reaction, and the amount of product formed will be determined by the amount of magnesium present.
One mole of magnesium fluoride has a molar mass of 62.3 g/mol (24.31 g/mol for Mg plus 2 x 18.99 g/mol for 2F). Therefore, the mass of magnesium fluoride formed can be calculated as:
[tex]Mass of MgF2 = 0.988 mol \times 62.3 g/mol = 61.5 g[/tex]
Therefore, the mass of magnesium fluoride produced when 24 g of magnesium reacts with 38 g of fluorine is approximately 61.5 g
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Which of the following choices describe the steps required to determine the empirical formula of a compound from the mass %? Select all that apply. Check all that apply. The mass percentage of each element is converted to moles using the mass mass formula molar mass If a compound contains 52% of mass of C, it can be assumed that there are 52 g of C in 100 g of the compound. Therato of atoms of each element must bo a rato of ntege nmbers If the sample contains 52 g of carbon, it is assumed that this compound has 52 mass percent of carbon. The mass percentages are divided among the smallest number to calculate the ratio of atoms of each element present.
The steps required to determine the empirical formula of a compound from the mass % are:
1. Convert the mass percentages of each element to moles using the molar mass formula.
2. Divide the mass percentages among the smallest number to calculate the ratio of atoms of each element present.
3. Ensure that the ratio of atoms of each element is a ratio of integer numbers.
What is empirical formula ?The empirical formula of a compound is the simplest whole number ratio of the elements present in the compound. It is often represented using the symbols of the elements involved and can be calculated from the relative masses of the elements. It is helpful in identifying the composition of a compound. For example, the empirical formula for glucose is CH2O, indicating that there is one carbon atom, two hydrogen atoms, and one oxygen atom present in the compound.
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The cooled sugar solution is (ideally) glassy in luster and fracture pattern, aphanitic with respect to crystal size, and vesicular. Choose all of the following household materials that have a similar luster or texture.
A. Window glass
B. Wooden cutting board
C. Cardboard, cereal box type
D. Ceramic plate
E. Styrofoam cup
F. Steel knife
G. Aluminum baking dish
There can be more than one selection.
This cooled sugar solution has glassy in luster & fracture pattern, aphanitic in regard to crystal, or vesicular. Glass, a wooden cutting board, or an aluminum baking dish are typical of these materials.
What is glassy behavior?Several soft materials, such as microparticles, foams, emulsions, or other complex fluids, exhibit glassy behavior, including plastics, superalloys, magnetic spin spectacles, disordered conductors, and many soft materials. Glassy phenomena are also present in very many biology, most notably protein.
What does glassy texture mean?This rock has a glassy appearance if it resembles a slab of (colored) glass and lacks mineral crystals that may be seen. The glassy texture gives the impression that cooling was so rapid that no crystalline could form.
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Water and Ammonia interact to form hydrogen bonds, as represent in the figure. Which statement best helps explain the formation of the hydrogen bond represented in the figure?
A. The oxygen has a partial positive charge, and the nitrogen had a partial negative charge.
B. The nitrogen has a partial negative charge, and the hydrogen attached to the oxygen has a partial positive charge.
C. The hydrogen attached to the oxygen has a partial negative charge, and the nitrogen also has a partial negative charge.
D. The nitrogen has a partial positive charge, and the hydrogen attached to the oxygen also has a partial positive charge.
The nitrogen has a partial negative charge, and the hydrogen attached to the oxygen has a partial positive charge.
What is hydrogen bond?A hydrogen bond is a type of intermolecular force that occurs when a hydrogen atom is covalently bonded to a highly electronegative atom (such as nitrogen, oxygen, or fluorine) in one molecule, and is attracted to an electronegative atom in another molecule. The electronegative atom acts as a hydrogen bond acceptor, while the hydrogen atom acts as the hydrogen bond donor.
Hydrogen bonds are also important in determining the physical and chemical properties of many compounds.
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Which ion could bond with a calcium ion (Ca2+) to form a neutral ionic compound?
A.
Cl-
B.
NO3-
C.
Mg2+
D.
S2-
Compared to the freezing point and boiling point of water at 1. 0 atm, a 0. 5 m aqueous solution of nacl at 1. 0 atm has.
Compared to pure water at 1.0 atm, a 0.5 M aqueous solution of NaCl at 1.0 atm has a lower freezing point of approximately -1.86°C and a higher boiling point of approximately 0.51°C.
The freezing point of a solution is lowered because the solute particles disrupt the formation of ordered ice crystals, making it more difficult for water to freeze. The extent of this effect depends on the concentration of solute particles in the solution. For a 0.5 M solution of NaCl, the freezing point depression is approximately -1.86°C.
The boiling point of a solution is raised because the solute particles increase the vapor pressure of the solution, making it more difficult for the liquid to boil. The extent of this effect also depends on the concentration of solute particles in the solution. For a 0.5 M solution of NaCl, the boiling point elevation is approximately 0.51°C.
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the mass spectrum of an organic compound shows the relative abundances of m m to be 44.75% 44.75 % and m 1 m 1 to be 2.904%. 2.904 % . assuming the peaks are caused by c12 c 12 and c13 c 13 isotopes, determine the number of carbon atoms in the compound. the natural abundance of c12 c 12 is 98.93%, and the natural abundance of c13 c 13 is 1.07%. number of carbon atoms:
The compound contains approximately 0.1486.02210^23 carbon atoms, or about 8.9*10^22 carbon atoms. Thus, the number of carbon atoms in the compound is approximately 15.
Define molecular formula.The molecular formula of a compound is a representation of the number and types of atoms that constitute one molecule of that compound.
To solve this problem, we can use the isotopic distribution of carbon in the compound to determine the molecular formula. The relative abundance of each isotope is related to the number of atoms of that isotope in the molecule.
Let's assume the molecular formula of the compound is CxHy, where x is the number of carbon atoms and y is the number of hydrogen atoms. We can use the following equation to relate the relative abundance of each isotope to the number of carbon atoms:
(0.9893)x(0.4475) + (0.0107)x(0.02904) = 0.02904
Simplifying this equation, we get:
0.443x + 0.00031268x = 0.02904
0.44331268x = 0.02904
x = 0.06556/0.44331268
x = 0.148
Therefore, the compound contains approximately 0.1486.02210^23 carbon atoms, or about 8.9*10^22 carbon atoms. Thus, the number of carbon atoms in the compound is approximately 15.
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The number of carbon atoms in the compound can be determined by calculating the ratio of C12 to C13 isotopes present.
What is carbon atoms?Carbon atoms are the building blocks of life. They are the most abundant element in the human body and make up the molecules that create all living things. Carbon atoms are found in proteins, carbohydrates, and lipids, and are essential for the functioning of all living organisms. Carbon atoms are made up of six protons, six neutrons, and six electrons, and are the backbone of organic chemistry.
Since the relative abundances of C12 and C13 are 44.75% and 2.904% respectively, the ratio of C12 to C13 can be calculated as follows:
C12/C13 = (44.75/2.904) = 15.39
We can then compare this ratio to the natural abundance of C12 and C13, which is 98.93% and 1.07%, respectively.
If the ratio of C12 to C13 in the compound is equal to the natural abundance of these isotopes, then the number of carbon atoms in the compound must be 12.
C12/C13 = (98.93/1.07) = 92.52
Since the ratio of C12 to C13 in the compound is not equal to the natural abundance of these isotopes, then the number of carbon atoms in the compound must be 13.
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Which of the following explains why there is a decrease in ionization energy for the group containing oxygen in the first four periods compared to the group containing nitrogen? Select the correct answer below: O Group 15 elements have completely filled p orbitals. O Group 15 elements have half-filled p orbitals. O Group 16 elements have completely filledp orbitals. O Group 16 elements have half-filled p orbitals.
The first four periods compared to the group containing nitrogen Group 15 elements have half-filled p orbitals.
What do you mean by elements?A basic part of a whole. In chemistry, refers to a simple substance that cannot be broken down into smaller parts or changed into another substance. The basic part of an element is an atom, which contains protons, neutrons, and electrons. All atoms of an element have the same number of protons.
WHAT IS elements and its types?The elements are classified as metal, non-metal, and metalloid. The extreme left side elements in the periodic table are metals, for example, sodium, calcium, caesium, etc. However, elements on the right side are generally referred to as non-metals, carbon, chlorine, oxygen, etc.
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However, it now seems that social inequality and reduced class mobility under oligarchy are social crises that are more far-reaching than economic crises, weakening national governance capacity internally and draining national soft power externally.
A decrease in the lower class's ability to move up the social ladder makes them less likely to revolt, which impedes the transition to democracy.
Social mobility and inequality: what are they?
Social mobility and inequality are separate but related issues. The first illustrates unequal access to resources, whereas the second shows how social justice, fairness, and equity are practiced in a society.
What is the primary factor causing social inequality?
The adoption of roles by society, stereotyping, social stratification based on class (or class systems), economic disparity, law, and political inequality are all contributing factors to social inequality.
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How much table salt would dissolve in 540mL of water if the water was 25 degrees Celsius? ( please show work)
At 25 °C, the about 194.4 g of table salt would dissolve in 540 ml of water.
At 25 degrees, what is the water concentration?At 25 °C, pure water has a concentration of 55.5 M (mol/L). H+ and OH- ions are ionized to a minor extent. Electrical conductivity experiments show that the equilibrium constant, also known as the dissociation constant, is 1.8 10-16 M at 25.
How much sodium chloride dissolves in 100 mL of water at 100 degrees Celsius?We draw this conclusion from the fact that 39.2 grams of sodium chloride dissolve in 100 grams of water at 100 degrees Celsius. The result is that the solution has exceeded the limit of the maximum permitted amount of NaCl for that mass of water by it is characterized as a supersaturated solution because of the tiny margin.
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leucine is an amino acid with the formula c6h13no2 c 6 h 13 no 2 . determine the number of moles of carbon in 57.77 g 57.77 g of leucine.
There are 3 moles of carbon in 57.77 g of leucine.
Define molar massMolar mass is the mass of one mole of a substance, typically expressed in units of grams per mole (g/mol).
To determine the number of moles of carbon in 57.77 g of leucine, we first need to find the molar mass of leucine.
The molar mass of leucine can be calculated by adding the atomic masses of all the elements in its chemical formula (C6H13NO2):
(6 x 12.01 g/mol) + (13 x 1.01 g/mol) + (1 x 14.01 g/mol) + (2 x 16.00 g/mol) = 131.18 g/mol Next, we can use the molar mass of leucine to convert the given mass of 57.77 g into moles:
57.77 g / 131.18 g/mol = 0.4408 mol
Finally, to determine the number of moles of carbon in 57.77 g of leucine, we can use the ratio of the number of carbon atoms to the total number of atoms in one molecule of leucine:
(6 carbon atoms / 1 molecule) x (0.4408 mol) = 2.645 moles of carbon
Therefore, there are 3 moles of carbon atoms in 57.77 g of leucine.
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Ammonium perchlorate is a powerful solid rocket fuel, used in the Space Shuttle boosters. It decomposes into nitrogen gas, chlorine gas, oxygen gas and water vapor, releasing a great deal of energy. Calculate the moles of nitrogen produced by the reaction of 1.6 mol of ammonium perchlorate.
Answer:
the answer is 1.6 moles.
Explanation:
The balanced chemical equation for the decomposition of ammonium perchlorate is:
NH4ClO4 → N2(g) + 2H2O(g) + Cl2(g) + 3O2(g)
From the balanced equation, we can see that for every 1 mole of ammonium perchlorate decomposed, 1 mole of nitrogen gas is produced.
Therefore, if we decompose 1.6 moles of ammonium perchlorate, we will produce 1.6 moles of nitrogen gas.
So the answer is 1.6 moles.
the compound known as diethyl ether, commonly referred to as ether, contains carbon, hydrogen, and oxygen. a 2.876 g 2.876 g sample of ether was combusted in an oxygen rich environment to produce 6.830 g 6.830 g of co2(g) co 2 ( g ) and 3.495 g 3.495 g of h2o(g) h 2 o ( g ) . insert subscripts to complete the empirical formula of ether.
The empirical formula of ether is C4H10O.
Define empirical formula.The empirical formula of a compound shows the simplest whole-number ratio of atoms present in the compound. To determine the empirical formula of diethyl ether (C2H5OC2H5), we need to know the mass of each element present in the compound.
In this problem, we are given the mass of diethyl ether that was combusted, which is 2.876 g. When diethyl ether is combusted in an oxygen-rich environment, it produces carbon dioxide and water. The masses of these products are also given: 6.830 g of carbon dioxide and 3.495 g of water.
We can start by calculating the mass of carbon in the original sample of ether. To do this, we use the molar mass of carbon dioxide (44.01 g/mol) and the stoichiometry of the combustion reaction:
2 C2H5OC2H5 + 7 O2 → 4 CO2 + 6 H2O
The balanced equation shows that for every two molecules of ether, four molecules of carbon dioxide are produced. Therefore, we can write:
2.876 g ether × (4 mol CO2 / 2 mol ether) × (1 mol C / 1 mol CO2) × (12.01 g / 1 mol C) = 5.716 g C
We can perform a similar calculation to determine the mass of hydrogen in the sample:
2.876 g ether × (6 mol H2O / 2 mol ether) × (2 mol H / 1 mol H2O) × (1.01 g / 1 mol H) = 4.352 g H
Finally, we can calculate the mass of oxygen by subtracting the masses of carbon and hydrogen from the total mass of the sample:
2.876 g ether - 5.716 g C - 4.352 g H = 0.808 g O
Now that we know the mass of each element, we can use these values to calculate the empirical formula. We divide each mass by the molar mass of the corresponding element, and then divide the resulting values by the smallest value to obtain whole-number ratios:
C: 5.716 g / 12.01 g/mol = 0.476 mol
H: 4.352 g / 1.01 g/mol = 4.31 mol
O: 0.808 g / 16.00 g/mol = 0.0505 mol
Dividing by the smallest value (0.0505 mol) gives the following ratios:
C: 9.43
H: 85.2
O: 1.00
To obtain whole-number ratios, we can divide each value by the smallest value:
C: 9.43 / 1.00 ≈ 9
H: 85.2 / 1.00 ≈ 85
O: 1.00 / 1.00 = 1
Therefore, the empirical formula of diethyl ether is C4H10O.
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what happens when you burn copper
Answer:
Explanation:
Copper oxidizes to copper When copper is heated in air, it is oxidised to copper (II) oxide and the reddish brown metal turns black as the copper is oxidised to copper (II) ions. Hence the copper is changed to copper oxide. Therefore, the copper gains oxygen in accordance with the given reaction.
how would you expect your pkin value to be different if you did not make the corrections to a {616nm}^{green} and a {453nm}^{green}
It should be noted that pKIn is the pH at which the indicator changes colour.
What is pH?In chemistry, the pH scale is used to define the acidity or basicity of an aqueous solution. Formerly, pH stood for "potential of hydrogen." The pH values of acidic solutions are lower than those of basic or alkaline solutions.
pKIn is the pH at which the indicator changes colour. Also, you can get given the Ka value and told to work out the pH. One awould have to use the equation Ka = [H+][A-]/[HA] , using [HA] = initial concentration of acid as weak acids have little dissocaition and for an acid on its own [H+] = [A-]
Note that an overview was given as your information is incomplete.
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Cu + 2 H2SO4 --> CuSO4 + SO2 + 2 H2O
20.0 g of Cu reacts with excess sulfuric acid to produce copper (II) sulfate, sulfur dioxide, and water.
When 45.5 g of CuSO4 is collected, what is the percent yield of copper (II) sulfate?
The percent yield of copper (II) sulfate is calculated by dividing the amount of copper (II) sulfate collected (45.5 g) by the amount of copper (II) sulfate theoretically produced (based on the amount of copper used in the reaction, 20.0 g):
What is copper?Copper is a naturally occurring element that is reddish in color and malleable. It is one of the only metals that is found in its pure form in nature. Copper has been used by humans since prehistoric times and is still widely used today in many industries. Copper is highly conductive and corrosion-resistant, making it ideal for electrical wiring, plumbing, cooking, and many other applications.
percent yield = (45.5 g CuSO4/20.0 g Cu) × 100 = 227.5%
This suggests that more copper (II) sulfate was produced than was expected, which is not possible - the amount of copper (II) sulfate produced should not exceed the amount of copper used in the reaction. This is most likely due to an incorrect mass measurement or an incorrect calculation.
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Michael drove 682 miles on 18. 6 gallons of gas. What was his gas mileage, rounded to the nearest mpg?.
Michael's gas mileage is calculated to be equal to approximately 37 miles per gallon.
What is mileage?Mileage is how many kilometers the vehicle is going to run per liter of fuel and it is also used to depict how many kilometers/ miles a vehicle has covered in its life time.
Gas mileage = distance / gas used
In this case, Michael drove 682 miles and used 18.6 gallons of gas, so his gas mileage is:
Gas mileage = 682 miles / 18.6 gallons = 36.67 miles per gallon
Gas mileage ≈ 37 miles per gallon
Therefore, Michael's gas mileage is approximately 37 miles per gallon.
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Use Henry's law to determine the molar solubility of helium at a pressure of 1.1 atm
and 25 ∘C . Henry’s law constant for helium gas in water at 25 ∘C is 3.70⋅10−4M/atm
.
Apply Henry's law to calculate the molecular absorption of helium at 1.5 atm, 25 °C, and 1.5 atm of pressure. Helium in water obeys Henry's law without exception.
A gas is what?Compared to other states of material, including such solids and liquids, gases get a lower density. Particles have such a great deal of kinetic energy and are not really attracted to one another, thus there is a lot of unoccupied space between them. One element, like hydrogen gas (Co and co2), a complex, like dioxide (CO2), or even a combination of multiple gases, like air, can make up a gas.
What does helium mean?Yet, helium is an essential component in numerous industries, such as high-tech manufacturing, medical technology, and scientific research.
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FILL IN THE BLANK. Most of the elements that are important in biology or low atomic mass and follow the octet rule. According to this rule, an atom is most stable when its outer or valence shell contains _____ electrons.
Most biologically significant elements have low atomic masses and adhere to the octet rule.This rule states that an atom would be most secure when it has eight electrons in its outer, or valence, shell.
What is the octet rule's foundation?0The hypothesis that main-group elements typically bind in a way that each atom gets eight electrons within its valence shell, providing it the same electrical configuration as just a noble gas, is reflected in the octet rule, a chemical rule of thumb.
What substances are permitted to defy the octet rule?Hydrogen, beryllium, and boron do not contain enough electrons to form an octet.In hydrogen, there is just one valence electron, and it has just one place where it can bond to another atom.
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Suppose that an aspartic acid (aspartate) residue in the active site of an enzyme was mutated to alanine. As expected, the alanine mutant was inactive, suggesting that the aspartic residue was critical to the catalytic mechanism. Which mutation is most likely to restore wild-type level of activity to the alanine mutant?
a. A to Y
b. A to E
c. A to L
d. A to M
e. A to K
Answer:
b. A to E
Explanation:
The aspartic acid (aspartate) residue in the active site of the enzyme is likely critical to the catalytic mechanism because it is a charged amino acid and can participate in ionic interactions that stabilize the transition state of the catalyzed reaction. Since the alanine mutant is inactive, we need to introduce a charged amino acid at this position to restore the activity.
Out of the options given, the mutation that is most likely to restore the wild-type level of activity to the alanine mutant is (b) A to E. The glutamic acid (glutamate) amino acid is similar to aspartic acid in its chemical properties, as both are negatively charged amino acids. Therefore, introducing a glutamic acid residue at the mutated position is likely to restore the ionic interaction necessary for catalytic activity.