The time taken to decay is 30 years
What is half life in radioactivity?In radioactivity, the half-life is the time it takes for half of the radioactive atoms in a sample to decay or disintegrate. The concept of half-life is important in understanding the behavior of radioactive materials and is used to describe the rate of radioactive decay.
Radioactive decay is a random process, which means that the time it takes for an individual atom to decay is unpredictable.
We know that;
N/No = (1/2)^t/t1/2
N = mass at time t
No = initial mass
t = time taken
t1/2 = half life
Thus we have that;
10/40 = (1/2)^t/15
(1/2)^2 = (1/2)^t/15
2 = t/15
t = 30 years
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How many grams make up 2.1 x 10^23 atoms of Titanium?
Answer:
≈16.67 grams
Explanation:
To solve this problem, we need to use the atomic mass of titanium to convert the number of atoms to grams. The atomic mass of titanium is 47.867 g/mol, which means that one mole of titanium atoms has a mass of 47.867 grams.
We are given the number of atoms of titanium, which is 2.1 x 10^23. We can use Avogadro's number to convert this to the number of moles of titanium:
2.1 x 10^23 atoms / (6.022 x 10^23 atoms/mol) = 0.349 moles
Now we can use the molar mass of titanium to convert moles to grams:
0.349 moles x 47.867 g/mol = 16.67 grams
Therefore, 2.1 x 10^23 atoms of titanium have a mass of approximately 16.67 grams.
Propane gas reacts with oxygen gas to give carbon dioxide gas and water vapor (gas). If you mix propane and oxygen in the correct stoichiometric ratio, and if the total pressure of the mixture is 300 mm hg, what are the partial pressures of.
Propane gas partial pressure is 300 mm.
Propane gas reaction - C3H8(g)+5O2(g)→3CO2(g)+4H2O(g)
As propane gas is a three-carbon alkali. It has a standard temperature and pressure. It can be compressed into a transport liquid. As per, the gas reacts with the air that is oxygen and gives carbon dioxide. We mix it with the correct ratio then the pressure mix is equal to 300 mm.
The answer is a partial pressure of propane gas 51mmHg and a part of the oxygen gas to be 249 mm. The propane gas is mixed with the oxygen gas and the gas reacts to give out carbon dioxide and thus measuring their correct stoichiometric ratio.
The gas produces a total pressure mix of 300 mg Hg and thus partial pressure is around 51 and that for oxygen is 249 mm. The partial pressure of a gas is 51 mmHg and part of the oxygen gas is 249 mm hg. That of water vapours of 171 mmHg.
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Balance the chemical equation
N2O5 -> N2 + O2
The balanced chemical equation for the decomposition of dinitrogen pentoxide(N₂O₅) into nitrogen gas (N₂) and oxygen gas (O₂) is: 2 N₂O₅ → 2 N₂ + 5O₂.
What is reaction?In chemistry, a reaction refers to a process in which one or more substances, called reactants, are transformed into one or more different substances, called products. Reactions can be caused by a variety of factors, such as heat, light, or the presence of a catalyst, and they can occur in a wide range of physical states, including gases, liquids, and solids. There are many different types of chemical reactions, which can be classified based on their mechanisms, the nature of the reactants, and the properties of the products. For example, a reaction can be classified as a redox reaction if there is a transfer of electrons between the reactants, or as an acid-base reaction if there is a transfer of protons between the reactants.
Here,
This equation is balanced because it has the same number of atoms of each element on both the reactant and product side. On the left side, there are 2 nitrogen atoms, 10 oxygen atoms, and 2 molecules of N₂O₅. On the right side, there are 2 nitrogen atoms, 10 oxygen atoms, and 1 molecule of O₂ and 1 molecule of N₂.
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In the following atomic model, where does the strong nuclear force happen? A diagram of an atom has three rings, labeled from outside to inside A, B, and C. A and B each carry two electrons. Inside ring C are 4 protons and 5 neutrons. outside A between A and B between B and C inside C Mark this and return
Therefore, the strong nuclear force happens inside ring C.
What is atomic model?An atomic model is a scientific theory or explanation of the structure of an atom. The atomic model describes the various parts of an atom, such as the nucleus, protons, neutrons, and electrons, and how they are arranged within the atom. Different atomic models have been proposed over time as our understanding of the atom has developed. The earliest atomic model, proposed by the Greek philosopher Democritus, suggested that atoms were indivisible and indestructible particles. Later, in the early 20th century, experiments led to the development of the modern atomic model, which describes the atom as consisting of a central nucleus made up of protons and neutrons, surrounded by electrons that orbit the nucleus in shells or energy levels. This model is known as the Rutherford-Bohr model. Since then, new atomic models have been developed that take into account the complex behavior of electrons within the atom, such as the quantum mechanical model. These models are used to explain the behavior and properties of atoms and their interactions with other atoms, molecules, and electromagnetic radiation.
Here,
The strong nuclear force occurs inside the nucleus of the atom, where the protons and neutrons are located. In the given diagram, the nucleus is located inside ring C, where there are 4 protons and 5 neutrons.
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Problem #4: Interpret reactions in terms of representative particles, then write balanced chemical
equations and compare with your results. Determine limiting and excess reagent and the amount of
unreacted excess reactant.
a) 3 atoms of carbon combine with 4 molecules of hydrogen to produce methane (CH4)
b) 7 molecules of hydrogen and 2 molecules of nitrogen gases react to produce ammonia
c) 4 molecules of hydrogen and 5 molecules of chlorine react.
Answer:
a) The balanced chemical equation for the reaction is:
3C (s) + 4H2 (g) → CH4 (g)
In this reaction, 3 carbon atoms combine with 4 molecules of hydrogen to produce one molecule of methane. The representative particles in this reaction are atoms of carbon and molecules of hydrogen and methane.
b) The balanced chemical equation for the reaction is:
2N2 (g) + 7H2 (g) → 2NH3 (g)
In this reaction, 7 molecules of hydrogen react with 2 molecules of nitrogen gas to produce 2 molecules of ammonia. The representative particles in this reaction are molecules of hydrogen, nitrogen, and ammonia.
c) The balanced chemical equation for the reaction is:
H2 (g) + Cl2 (g) → 2HCl (g)
In this reaction, 4 molecules of hydrogen react with 5 molecules of chlorine gas to produce 10 molecules of hydrogen chloride. The representative particles in this reaction are molecules of hydrogen, chlorine, and hydrogen chloride.
To determine the limiting and excess reagents and the amount of unreacted excess reactant, we need to know the initial amounts of each reactant. Without this information, we cannot determine the limiting and excess reagents or the amount of unreacted excess reactant.
Describe the effect of the changes below on the system in which the following reversible reaction is taking place: 4HCl(gas) + O₂(gas) -> 2Cl₂(gas) + 2H₂O(gas) + energy.
a. The pressure of the system increases.
b. The pressure of the system decreases.
c. The concentration of O, decreases.
d. The temperature of the system increases.
According to Le Chatelier's Principle, a system that is in equilibrium will adapt to partially offset the effects of fluctuations.
What is Le Chatelier's Principle?According to Le Chatelier's Principle, a system that is in equilibrium will adapt to partially offset the effects of fluctuations in temperature, volume, concentration, as well as pressure, leading to a new equilibrium.
In the equation for equilibrium, 4HCl(gas) + O₂(gas) → 2Cl₂(gas) + 2H₂O(gas) + energy. If the system's pressure rises, the equilibrium will move to the right. If the system's pressure drops, the equilibrium will move to the left. Oxygen concentration will drop, and equilibrium will move to the left. If the system's temperature rises, equilibrium will move to the right.
Therefore, according to Le Chatelier's Principle, a system that is in equilibrium will adapt to partially offset the effects of fluctuations.
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A gas has a volume of 28 L in a temperature of of 85°C has its volume increased 42 L and its temperature decrease to 47°C if I measure the pressure after the change to be 2.0 Atm what is the original pressure of the gas?
Answer:
Below
Explanation:
"has its volume increased 42 L" <===so final volume is 48+28 (as written)
P1V1 / T1 = P2V2 / T2 T must be in Kelvin (add 273.15 to °C)
Looking for P1
Re-arrange
P1 = P2 V2 / T2 * T1 / V1 sub in the values
P1 = (2)(42+28) / (47+ 273.15) * (85+273.15) /(28)
P1 = 5.59 atm
Describe and explain the possible effect on your results of the following experimental errors or variations. (a) You used solvent-grade (not anhydrous) diethyl ether for the reaction in part A. (b) After adding the bromobenzene solution in part A, you forgot to add anhydrous diethyl ether to the reaction mixture. (c) You used diethyl ether, rather than petroleum ether, to remove biphenyl from the crude triphenylmethanol.
Omitting the anhydrous diethyl ether may cause the reaction to be incomplete, resulting in a lower yield of the desired product.
What is anhydrous ?Anhydrous is a term used to refer to a substance that is without water. It is derived from the Greek words "a" meaning without and "hydor" meaning water. Anhydrous materials are often used in laboratory and industrial processes because they are more reactive than their hydrated (with water) counterparts. Anhydrous materials can also be found in everyday items such as food, beverages, and medicine.
(a) The use of solvent-grade diethyl ether may lead to poor product yields due to the presence of water in the solvent. The water present in the solvent can lead to side reactions and reduced product yields.
(c) Using diethyl ether, rather than petroleum ether, to remove biphenyl from the crude triphenylmethanol may lead to a decrease in product yields due to the higher boiling point of the diethyl ether.
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Phosphoric acid, H3PO4(aq),
is a triprotic acid, meaning that one molecule of the acid has three acidic protons. Estimate the pH and the concentrations of all species in a 0.100 M phosphoric acid solution.
pKa1 pKa2 pKa3
2.16 7.21 12.32
Acid phosphoric Hydrogen is a triprotic acid, which means that each molecule of acid contains three protons that are acidic.
What do protons do?Radiation therapy can make use of streams of protons produced by specialised equipment.
These electrons move in distinct orbits around the nucleus. (ii) The mass of protons, which have a positive charge, is about 1 amu. His study during this time produced a nuclear reaction that caused the first atom to "split" in two.
How do atoms work?The centre of every atom is called the nucleus, which is made up of neutral neutrons and protons (positive particles). Around the nucleus are electrons, which are negative particles. Unlike atoms of different elements, which have varying chemical characteristics and masses, all of an element's atoms have the same mass.
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A student mixes 5.00 mL of 2.00 x 10-3 M Fe(NO3)3 with 5.00 mL of 2.00 x 10-3 M KSCN. She finds that in the equilibrium mixture the of concentration of FeSCN2+ is 1.40 x 10-4 M.
a) What is the initial concentration in solution of the Fe3+ and SCN- ?
b) What is the equilibrium constant for the reaction?
part a.)
The initial concentration in solution of the Fe3+ and SCN- is:
moles of Fe3+ = (2.00 x 10^-3 M) x (5.00 x 10^-3 L) = 1.00 x 10^-5 mol
moles of SCN- = (2.00 x 10^-3 M) x (5.00 x 10^-3 L) = 1.00 x 10^-5 mol
part b)
The equilibrium constant for the reaction is 1.54 x 10^10.
How do we calculate?Fe(NO3)3(aq) + 3KSCN(aq) ⇌ Fe(SCN)3(aq) + 3KNO3(aq)
b)
Therefore, the equilibrium concentration of Fe(SCN)2+ is also 1.40 x 10^-4 M.
Applying law of mass action, the equilibrium constant expression for the reaction is:
Kc = [Fe(SCN)2+] / ([Fe3+] [SCN-]3)
Kc = (1.40 x 10^-4) / [(1.00 x 10^-5) (1.00 x 10^-5)^3]
Kc = 1.54 x 10^10
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The empirical formula of p-dichlorobenzene is C3H2Cl. What is the molecular formula if its molar mass is 147 g/mol? Pls help I will give brainliest.
The molecular formula of p-dichlorobenzene is C6H4Cl2.
What is an empirical formula?The simplest whole-number ratio of the atoms in a compound is an empirical formula. In other words, it shows the relative number of atoms of each element in a compound, but not the actual number of atoms or the molecular structure. Empirical formulas are often determined by experimental data, such as the mass percentages of each element in the compound, and they are useful for comparing the compositions of different compounds.
The molar mass of the empirical formula can be calculated as follows:
C3H2Cl:
3C = 3 x 12.01 g/mol = 36.03 g/mol
2H = 2 x 1.01 g/mol = 2.02 g/mol
1Cl = 1 x 35.45 g/mol = 35.45 g/mol
Total molar mass = 73.50 g/mol
Now we can calculate the molecular formula by dividing the molar mass of the compound by the molar mass of the empirical formula, and then multiplying each subscript in the empirical formula by this number:
Molecular mass / empirical mass = 147 / 73.50 = 2
C3H2Cl x 2 = C6H4Cl2
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HELP ME ASAP FOR BRAINLIST
Why is it often colder on cloudy summer days?(
More sunlight is transmitted than reflected by the white upper surface of clouds.
More sunlight is reflected than transmitted by the white upper surface of clouds.
More sunlight is absorbed than transmitted by the dark lower layer of clouds.
More sunlight is reflected than transmitted by the white upper surface of clouds.
Why is it often colder on cloudy summer days?Clouds can affect the temperature on summer days in a few ways. One reason why it can be colder on cloudy summer days is that clouds reflect some of the sun's energy back into space, which means less of the sun's energy reaches the ground. This can result in lower temperatures, as there is less heat to warm the air and the surface of the Earth.
Therefore, the combined effect of reflected solar radiation and scattered light from clouds, and the trapping of heat by water vapor in the clouds can make it feel colder on cloudy summer days, even though it is still summer.
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Arrange the following aqueous solutions in order of decreasing freezing points: 0.10 m KNO3, 0.10 m BaCl2, 0.10 m ethylene glycol [C2H4(OH)2, antifreeze], and 0.10 m Na3PO4.
Answer:
The freezing point of a solution is lowered compared to the freezing point of the pure solvent. The amount of depression of the freezing point is proportional to the molality of the solute. The greater the molality of a solution, the lower its freezing point. To compare the freezing points of these solutions, we need to determine which one has the highest molality.
First, we need to determine the number of particles that each solute will produce in solution, as this affects the amount of depression of the freezing point.
KNO3 dissociates into two ions: K+ and NO3-, so it will produce two particles per formula unit.
BaCl2 dissociates into three ions: Ba2+ and two Cl-, so it will produce three particles per formula unit.
Ethylene glycol does not dissociate in solution, so it will produce one particle per molecule.
Na3PO4 dissociates into four ions: three Na+ and one PO43-, so it will produce four particles per formula unit.
Now, we can calculate the molality (moles of solute per kilogram of solvent) for each solution:
For 0.10 m KNO3: molality = 0.10 mol / 1 kg = 0.10 m
For 0.10 m BaCl2: molality = 0.10 mol x 3 particles / 1 kg = 0.30 m
For 0.10 m ethylene glycol: molality = 0.10 mol / 1 kg = 0.10 m
For 0.10 m Na3PO4: molality = 0.10 mol x 4 particles / 1 kg = 0.40 m
So, the solutions in order of decreasing freezing points are:
0.10 m Na3PO4 (highest molality)
0.10 m BaCl2
0.10 m KNO3 and 0.10 m ethylene glycol (same molality, but KNO3 has a smaller van't Hoff factor than ethylene glycol, so it will have a slightly higher freezing point)
Explanation:
What two features are parts of a line graph
Answer:
The x-axis (horizontal) and the other along the y-axis (vertical).
Explanation:
hope that helped. :')
Calculate the molarity of a solution prepared by adding 15. 56 g of koh to water to make 250. 0 ml of solution.
The molarity of the solution prepared by adding 15. 56 g of the KOH to water to make 250. 0 ml of solution is 1.10 M.
The mass of the KOH = 15.56 g
The volume of the KOH = 250 mL
The molarity is expressed as :
The molarity = moles / volume in L
The number of the moles of the KOH = mass / molar mass
The number of the moles of the KOH = 15.56 / 56.10
The number of the moles of the KOH = 0.277 mol
The molarity = moles / volume
The molarity = 0.277 / 0.250
The molarity = 1.10 M
Thus, the molarity of the solution is 1.10 M with the volume of 250 mL.
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Suppose that you lost some of the weighted unknown in the process of adding it to the naphthalene. How would this affect your calculated molecular weight? Explain.
Answer:
Explanation:
If some of the weighted unknown was lost during the process of adding it to the naphthalene, it would affect the accuracy of the calculated molecular weight. The loss of some of the weighted unknown would result in a smaller mass being added to the naphthalene than what was intended, leading to an underestimation of the molecular weight.
To calculate the molecular weight of the unknown, the mass of the unknown is divided by the mass of the naphthalene that was used, and the result is multiplied by the molecular weight of naphthalene. If some of the unknown was lost, the mass of the unknown that was actually added to the naphthalene would be less than the measured mass of the unknown. As a result, the calculated molecular weight would be smaller than the actual molecular weight of the unknown.
For example, suppose that the measured mass of the unknown was 2 grams, but 0.5 grams were lost during the process of adding it to the naphthalene. If the mass of naphthalene used was 10 grams, the mass of the unknown added to the naphthalene would be 1.5 grams (2 grams - 0.5 grams). If the actual molecular weight of the unknown was 100 g/mol, the calculated molecular weight using the formula would be:
Molecular weight of unknown = (1.5 grams / 10 grams) x 128 g/mol (the molecular weight of naphthalene)
Molecular weight of unknown = 19.2 g/mol
However, the actual molecular weight of the unknown is 100 g/mol, and the loss of some of the unknown resulted in an underestimation of the molecular weight. Therefore, it is important to be as accurate as possible when measuring the mass of the unknown to obtain the most accurate molecular weight calculation.
How many grams of sodium sulfate will be formed if you start with 200. grams of sodium hydroxide and an excess sulfuric acid, H2SO4 ?
2 NaOH + H2SO4 --> 2 H2O + Na2SO4
The balanced equation is :
2NaOH + H2SO4 → Na2SO4 + 2H2O
2 × 40g of NaOH gives 142g of Na2SO4
200g of NaOH gives = 355g
Therefore,
Mass of Na2SO4 formed = 355g
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When 200 grams of sodium hydroxide (NaOH) is reacted with an excess of sulfuric acid (H2SO4), the reaction produces two moles of water (2 H2O) and one mole of sodium sulfate (Na2SO4).
What is sodium hydroxide?Sodium hydroxide, commonly known as lye, is an inorganic compound with the chemical formula NaOH. It is a white, crystalline solid that is highly alkaline, with a pH of around 13. Sodium hydroxide is highly soluble in water, with a solubility of 2.2 g/100 mL at 25°C. It is used in many industries, such as in the manufacture of paper, soap, and detergents, as a drain cleaner, and in food processing. Sodium hydroxide can also be used in the laboratory for titrations, pH adjustments, and other purposes.
Since one mole of sodium sulfate is equal to 142 grams, the total amount of sodium sulfate produced in this reaction is 200 grams of NaOH x (1 mole Na2SO4/2 moles NaOH) = 142 grams Na2SO4.
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What happens to cells when too much water moves inside
Answer:
Hyponatremia
Explanation:
When too much water moves inside a cell, it can lead to a condition called hyponatremia, which is a condition of low sodium concentration in the blood. This can happen when an individual drinks excessive amounts of water, which dilutes the sodium content in the blood.
When the concentration of sodium in the blood decreases, water moves into the cells to try to balance the concentrations, causing the cells to swell. In the case of brain cells, the swelling can be particularly dangerous because the skull limits the space available for the swelling, leading to increased pressure inside the skull. This can result in symptoms such as headaches, nausea, seizures, and even coma in severe cases.
In addition to the swelling of cells, hyponatremia can also lead to other complications such as electrolyte imbalances and impaired nerve and muscle function. Therefore, it is important to maintain a balance of fluid intake and electrolyte levels to prevent hyponatremia and other related conditions.
Answer: A cell placed into a hypotonic solution will swell and expand until it eventually burst through a process known as cytolysis.In hypotonic solutions, there is a net movement of water from the solution into the body. A cell placed into a hypotonic solution will swell and expand until it eventually burst through a process known as cytolysis.
Explanation: In hypotonic solutions, there is a net movement of water from the solution into the body. A cell placed into a hypotonic solution will swell and expand until it eventually burst through a process known as cytolysis.
QUESTION 16
When zinc metal reacts with copper (II) sulfate solution the substance receiving electrons is:
Zn (s)
O Cu (s)
O zn 2+ (aq) in ZnSO4 (aq)
O Cu 2+ (aq) in CuSO4 (aq)
Answer:
Cu 2+ (aq) in CuSO4 (aq)
Explanation:
In the reaction between zinc metal and copper (II) sulfate solution, the zinc metal is oxidized and loses electrons to form zinc ions, Zn^2+, which go into the solution as zinc sulfate, ZnSO4. The copper (II) ions, Cu^2+, in copper (II) sulfate solution is reduced and gain the electrons that the zinc metal lost, forming solid copper metal, Cu(s).
So the substance receiving electrons in this reaction is the copper (II) ions, Cu^2+, in CuSO4 solution, which gets reduced to form copper metal.
Without checking the detailed numbers, please arrange the ionic compounds CsI, MgO, NaCl, and AlN in order of increasing lattice energy.
For the above compounds, the order of increasing lattice energy is MgO, NaCl, CsI, and AlN.
Which is ionic? MgO or NaCl?Because the ionic species in MgO have greater charge (Mg+2 and O2- as opposed to Na+ and Cl-), the ionic bond is stronger than it is in NaCl. As a result, MgO has greater ionic connections than NaCl. MgO is hence more ionic than NaCl.
whose MgO lattice energy is the highest?The size of the ions involved has an inverse relationship with lattice energy in ionic compounds. MgO has the highest lattice energy because Mg2+, the smallest of the four ions (because anion is the same in all), is present.
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The mass of a single nickel atom is 9.75×10-23 grams. How many nickel atoms would there be in 211 milligrams of nickel?
A gas evolved from the fermentation of glucose is found to effuse through a porous barrier in 15.0 min. Under the same conditions of temperature and pressure, it takes an equal volume of N2 12.0 min to effuse through the same barrier. Calculate the molar mass of the gas and suggest what the gas might be.
The molar mass we calculated, 17.92 g/mol, is much lower than the molar mass of CO2, so it is unlikely that the gas is CO2.
What is rate of effusion?Rate of effusion is the measure of the speed at which a gas escapes through a tiny opening, such as a small hole or a porous barrier, into a vacuum or another region of lower pressure. The rate of effusion is determined by the average speed of the gas particles and the size of the opening through which they pass. The rate of effusion of a gas is inversely related to the square root of its molar mass, according to Graham's law of effusion.
The square root of a gas's molar mass has an inverse relationship with the rate of effusion of that gas. The rate of effusion is expressed as follows:
rate1/rate2 = sqrt(MM2/MM1)
where rate1 and rate2 are the rates of effusion of the two gases and MM1 and MM2 are their molar masses.
Using the given data, we can write:
rate1/rate2 = sqrt(MM2/MM1)
1/15 = sqrt(MM2/MMglucose)
1/12 = sqrt(MM2/MMN2)
Dividing these two equations, we get:
1/15 ÷ 1/12 = sqrt((MM2/MMglucose)/(MM2/MMN2))
4/5 = sqrt(MMglucose/MMN2)
Squaring both sides, we get:
16/25 = MMglucose/MMN2
MMglucose = (16/25) x 28 = 17.92 g/mol
The molar mass of glucose is 180 g/mol. The gas evolved from the fermentation of glucose is mainly carbon dioxide (CO2), so the molar mass of the gas is close to the molar mass of CO2, which is 44 g/mol. The molar mass we calculated, 17.92 g/mol, is much lower than the molar mass of CO2, so it is unlikely that the gas is CO2.
A possible gas that could be produced from the fermentation of glucose is methane (CH4). The molar mass of methane is 16 g/mol, which is closer to the molar mass we calculated. Therefore, the gas evolved from the fermentation of glucose could be methane.
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Ammonium phosphate is an important ingredient in many solid fertilizers. It can be made by reacting aqueous phosphoric acid with liquid ammonia. Calculate the moles of ammonium phosphate produced by the reaction of 0. 085 mol of ammonia. Be sure your answer has a unit symbol, if necessary, and round it to the correct number of significant digits
The moles of ammonium phosphate produced by the reaction of 0. 085 mol of ammonia is 0.042 moles
Balanced chemical equationThe balanced chemical equation for the reaction between phosphoric acid and liquid ammonia to produce ammonium phosphate is:
2NH₃ + H₃PO₄ → (NH₄)₂HPO₄
From the balanced equation, we can see that 2 moles of ammonia react with 1 mole of phosphoric acid to produce 1 mole of ammonium phosphate.
Stoichiometric calculationTo find the moles of ammonium phosphate produced from 0.085 moles of ammonia, we can use the mole ratio from the balanced equation:
(0.085 moles NH₃) × (1 mole (NH₄)₂HPO₄ / 2 moles NH₃) = 0.0425 moles (NH₄)₂HPO₄
Therefore, the moles of ammonium phosphate produced by the reaction of 0.085 moles of ammonia is 0.0425 moles. The answer should be rounded to the correct number of significant digits, which is 2, since the given value of ammonia has 2 significant digits.
The final answer is 0.042 moles of ammonium phosphate.
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along which of the lines (a to h) in (figure 1) should charge 2 be placed so that the free-body diagrams of charge 1 and charge 2 are consistent? note that only one of the forces on each charge will be consistent. the other force on each charge will be addressed in part b with the introduction of charge 3.
As the forces between each pair of charges will be equal in magnitude and opposite in direction for the force on charge 1 to match with force on charge 2 as when placed on line C , the force lines of charge 2 and 1 will match.
How to explain the forceIt should be noted that the diagram relating to the question had been attached.
For B, as the force due to charge 3 must be horizontal along D on charge 1 , and the force between 1 and 3 is attractive ,
the charge 3 must be placed at D
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which of the following would be an observation you could make to indicate that a reaction had taken place? check all that apply.
A. an increase in volume
B. a decrease in volume
C. a rise in temperature
D. a drop in temperature
The following observations could indicate that a reaction had taken place:
C. A rise in temperature
D. A drop in temperature
What is a reactionA change in temperature can indicate that energy has been released or absorbed during the reaction, which can be an indicator that a chemical reaction has taken place.
Changes in volume, on the other hand, are not always an indicator that a chemical reaction has occurred, as they could also be due to physical changes (such as changes in pressure or the addition/removal of a gas). Therefore, A and B alone are not sufficient to indicate that a reaction has taken place.
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The vapor pressure, ,
of a certain liquid was measured at two temperatures, .
The data is shown in the table.
T (K) P (kPa)
275 3.32
675 5.66
Keep the pressure units in kilopascals.
If you were going to graphically determine the enthalpy of vaporizaton, Δvap,
for this liquid, what points would you plot? To avoid rounding errors, use three significant figures in the
‑values and four significant figures in the
‑values.
the boiling point Boiling temperature is the point at which a liquid's vapor pressure equals the atmospheric pressure.
What occurs when the pressures being applied to the liquid and the water's vapor pressure are equal?When the liquid's vapor pressure equals the air pressure acting on it, the liquid transitions from a liquid state to a gaseous phase. Although boils is a physical transformation, molecules are still not chemically changed.
How hot and how pressured must it be for a liquid and just a gas to be in equilibrium?The line is broken at the substance's boiling point since a liquid's typical boiling point is now between point B and C the temperature where the fluid and gas are already in equilibrium at one atmosphere of pressure, with the resulting liquid vapor pressure being one atmosphere.
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Nitrogen gas at a stagnation temperature of 300 K and a static pressure of 2 bar flows adiabatically through a pipe duct of 0.3 m diameter. At a particular station along the duct length the Mach number is 0.6. Assuming the flow is frictionless, determine a. the static temperature and stagnation pressure of the flow; b. the mass flow of gas if the duct diameter is 0.3 m. For nitrogen gas take R 5 297 J/(kg K) and γ 5 1:4.
The static temperature and stagnation pressure of the flow are 279.9K and 2.551bar respectively.
What is stagnation pressure?Stagnation pressure, also known as pitot pressure and total pressure in fluid dynamics as well as aerodynamics, is indeed the static pressure at a place where a fluid flow has stopped.
The fluid has no motion as well as all linear acceleration has indeed been transformed to pressure energy at such a stagnation point.
a)Po/p = (1+ (γ-1)M²/2)^γ/γ-1
substituting all the given values in the above equation, we get
Po/2 = (1+ (1.4-1)0.6²/2)^1.4/1.4-1
Po =2.551bar
b)To/T = 1 +( γ-1/2)M²
substituting all the given values in the above equation, we get
300/T = 1 +( 1.4-1/2)0.6²
T=279.9K
c)M=c/√γRT
0.6=c/√1.4×8.31×279.9
c=204.68
A =πD²/4
A =3.14×0.3²/4=0.07m²
m= ρAc
m= 1.90×0.07×204
=27.16Kg/s
Therefore, the static temperature and stagnation pressure of the flow are 279.9K and 2.551bar respectively.
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PLS HELP ASAP
(50 POINTS)
The reaction C(s) + O₂ (g) → CO₂ (s) has a AH=-394kJ .
How much heat will be required to produce 1 mole of Fe by the reverse reaction?
A) -394 kJ
B) -197 kJ
C) 394 kJ
D) 788 kJ
Answer: The answer is A) -394
Explanation:
This worked for me
Which compound is a strong electrolyte?
Please choose the correct answer from the following choices, and then select the submit answer button.
Answer choices
Be(OH)2
BeS
Be3(PO4)2
Be(NO3)2
Be(OH)₂ compound is a strong electrolyte.
What is strong electrolyte?A solid or liquid that totally or almost completely ionises or dissociates in a solution is considered a strong electrolyte. In the solution, these ions function well as electrical conductors. An early definition of a "strong electrolyte" was a substance that is an effective conductor of electricity when dissolved in water. Strong electrolytes are those that totally dissociate or ionise when placed in aqueous solution. These electrolytes have a high electrical conductivity and a greater ionisation extension. NaCl, HCl, NaOH, etc. are a few examples.
Correct option: Be(OH)₂
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A 300-mg sample of technetium-99m is used for a diagnostic test. If téchnetium-99m has an effective half-life of 4.8 hours, how much of the
technetium-99m remains 96 hours after the test?
Express your answer to two significant figures and include the appropriate units.
Valae
Units
?
Answer:
i like butting hole
Explanation:
mkrkr