Explanation:
Distance between earth and moonthickness of bill
384,403÷0.0043Answer= 89396046.51
A thermally insulated system consists of 1.00 mol of a diatomic gas at 148 K and 2.00 mol of a solid at 178 K that are separated by a rigid insulating wall. Find the equilibrium temperature of the system after the insulating wall is removed, assuming that the gas obeys the ideal-gas law and that the solid obeys the Dulong-Petit law. HINT: the gas does no work during the expansion, so Qgas = AEint = nc', AT. K Submit
169.2K is the equilibrium temperature of the system after the insulating wall is removed.
What is equilibrium?Generally speaking, a condition of equilibrium is one in which nothing is changing. A body in equilibrium won't undergo any energy exchanges, either positive or negative. Equilibrium is defined significantly differently in biology, physics, and chemistry.
Yet the underlying idea is the same. A body in balance will be least affected by outside influences. Even when external pressures are present, the opposing forces often have a balanced impact on the item under consideration.
for gas, n1=1mol
T1= 148K
for solid,n2=2mol
T2=178K
for conservation of energy, ΔQ= Qgas+ Qsolid=0
Q= CvΔT
0=Cvgas(Teql-148) + Cvsolid(Teq-178)
0= 5/2×1×R(Teql-148) + 3×2×R(Teq-178)
Tequi= 169.2K
Therefore, 169.2K is the equilibrium temperature of the system after the insulating wall is removed.
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You must determine the moles of calcium chloride necessary to react with all of the unknown carbonate. If you have 0.335 grams of unknown carbonate with a molar mass of 127.330 g/mol, what is the minimum moles of calcium chloride necessary?
The minimum moles of calcium chloride necessary to react with all of the unknown carbonate is 0.0026 mol.
What is carbonate?Carbonate is a compound containing an anion of carbonate (CO3) and a cation of a metal, such as sodium, calcium, or magnesium. Carbonates are compounds of carbon and oxygen, and are found in many mineral forms, including limestone, marble, chalk, and dolomite. Carbonates are widely used in the construction, food processing, and chemical industries, and are also important components of soil and sediments.
The first step is to calculate the number of moles of carbonate present in the sample. This is done by dividing the mass of the sample by the molar mass of the carbonate:
0.335 g / 127.330 g/mol = 0.0026 mol
Next, we need to calculate the moles of calcium chloride needed to react with all of the carbonate. Since the reaction is a 1:1 ratio, we need the same number of moles of calcium chloride as the moles of carbonate present in the sample:
0.0026 mol CaCl2 = 0.0026 mol
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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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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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consider the following chemical reaction which produces hf from its constituent elements: h 2 (0)+f 2(0) 2 hf (0) delta t h=-546.6 kj/mol hydrogen and fluorine were mixed and allowed to react under constant pressure conditions, which of the following statements must be true? select as many answers as applicable however points will be deducted for incorrect guesses. the temperature of the surroundings would decrease ο triangle h= triangle u this is an endothermic reaction triangle h=0 the temperature of the surroundings would increase
As the formation of HF is an exothermic reaction, the temperature of the surroundings would increase.
What is an exothermic reaction?An exothermic reaction is defined as a chemical reaction which involves release of energy in the form of light,heat .In these reactions, energy is transferred from system to surroundings rather than taking energy from surroundings into system as in endothermic reactions.
In an exothermic reaction,change in enthalpy is negative.Therefore, it can be inferred that net amount of energy which is required to start the exothermic reaction is less than the net amount which is released by the reaction.
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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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need help on this and explain
Answer:
2AlCl3 to 3Cl2
Explanation:
This is balanced equation: 2AlCl3 + 3Br2 => 2AlBr3 + 3Cl2
with 2 Al, 6 Cl and 6 Br
So 2AlCl3 to 3Cl2
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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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.
when 5.50 g of magnesium burns in excess oxygen, the theoretical yield (amount produced) of magnesium oxide is ____ g. (molar mass: mg)
5.50 g of magnesium will produce 5.50/24.30 g of magnesium oxide, which is 0.2265 g of magnesium oxide.
What is Magnesium?Magnesium is a chemical element and an abundant mineral in the Earth's crust. It is the eighth most abundant element in the Earth's crust, and the third most abundant in seawater. It is also found in many foods, and is an essential mineral for human health. Magnesium is involved in more than 300 metabolic reactions in the body and is important for muscle and nerve function, and healthy bones. It also helps regulate blood sugar levels, blood pressure, and the production of energy and protein.
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2. explain why the gem-dimethyl groups appear as separate peaks in the proton-nmr spectrum of isoborneol, although they almost overlap in borneol.
This is most likely caused by a through-space interaction in compound isoborneol between one of the geminal methyl groups and the hydroxide, which is pointing upwards.
What is a compound?Compound is defined as a chemical substance made up of identical molecules containing atoms from more than one type of chemical element.
Molecule consisting atoms of only one element is not called compound.It is transformed into new substances during chemical reactions. There are four major types of compounds depending on chemical bonding present in them.They are:
1)Molecular compounds where in atoms are joined by covalent bonds.
2) ionic compounds where atoms are joined by ionic bond.
3)Inter-metallic compounds where atoms are held by metallic bonds
4) co-ordination complexes where atoms are held by co-ordinate bonds.
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Please help!!
50.0 mL of water at 4° C frozen to ice. The volume of the ice produced is 46.0 mL. What is the density and specific gravity of the ice?
The density of the ice is approximately 1.09 g/mL and its specific gravity is approximately 1.09.
How to find the density and specific gravity of the ice?
First, we need to convert the volume of water from milliliters to grams. The density of water at 4°C is 1 g/mL. Therefore, the mass of the water is:
mass = volume × density = 50 mL × 1 g/mL = 50 g
Next, we can use the conservation of mass to find the mass of the ice produced. The mass of the ice must be equal to the mass of the water, so:
mass of ice = mass of water = 50 g
Now, we can find the density of the ice:
density = mass of ice ÷ volume of ice = 50 g ÷ 46 mL ≈ 1.09 g/mL
Finally, we can find the specific gravity of the ice by comparing its density to the density of water. Since the density of water at 4°C is 1 g/mL, the specific gravity of the ice is:
specific gravity = density of ice ÷ density of water = 1.09 g/mL ÷ 1 g/mL ≈ 1.09
Therefore, the density of the ice is approximately 1.09 g/mL and its specific gravity is approximately 1.09.
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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. :')
Based on your knowledge of genetics answer the following question in 3-4 paragraphs. Be sure and include relevant content vocabulary.
A 20 – year old man who has cystic fibrosis has a sister who is planning to have a child. The man encourages his sister to see a genetic counselor. What do you think the man’s reasons are for giving such advice? Please provide references that support your stance.
Answer:
The 20-year-old man's sister may be at risk of having a child with cystic fibrosis if that causes the condition. Cystic fibrosis is an inherited disorder caused by a mutation in the CFTR gene that affects the production of mucus in the body, leading to lung infections, digestive problems, and other complications. The disease is inherited in an autosomal recessive pattern, meaning that a person must inherit two copies of the defective gene (one from each parent) to develop the condition.
The man's advice to his sister to see a genetic counselor is likely motivated by his concern for her and the potential child's health. A genetic counselor is a healthcare professional who specializes in assessing and counseling individuals and families on the risks and implications of genetic conditions. A genetic counselor can provide the sister with information about her risk of being a carrier of the CFTR gene mutation and the likelihood of passing it on to her children. The counselor can also discuss the different options for testing and provide guidance on how to manage the risk of having a child with cystic fibrosis, such as through preconception or prenatal testing, genetic counseling, or assisted reproductive technologies.
The man's recommendation is in line with the current guidelines of many medical organizations, including the American College of Obstetricians and Gynecologists (ACOG), which recommend that individuals who have a family history of genetic disorders or are carriers of certain gene mutations should be offered genetic counseling and testing. This approach can help identify and manage the risk of having a child with a genetic disorder and provide support and education to families.
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 attached Below:
The mass of the ammonium chloride is 69.6 g
What is the freezing point?The freezing point is the temperature at which a liquid transitions into a solid at a given pressure. At the freezing point, the vapor pressure of the solid and the liquid phases of the substance are equal, and the substance transitions from a liquid phase to a solid phase as it releases heat.
We know that;
For glycine;
ΔT = K m i
2.8 = K * 169/75 * 1/1.5 * 1
2.8 = K * 1.5
K = 2.8/1.5
K = 1.86
Then;
If I have ammonium chloride;
Let the mass of the solute be m
2.8 = 1.86 * m/53 * 1/1.5 * 1.74
2.8 = 1.86 * m/79.5 * 1.74
2.8 = 3.2m/79.5
m = 2.8 * 79.5/3.2
m = 69.6 g
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(a) Write a balanced equation for the coupling reaction of bromobenzene on the metal surface to form biphenyl.
(b) Write balanced equations for the reactions of phenylmagnesium bromide and trityl fluoborate with water.
The balanced equation for the coupling reaction of bromobenzene on the metal surface to form biphenyl is mentioned below.
What is a coupling reaction?The coupling reactions are a class of chemical reactions where unification of two or more hydrocarbons coupled with the help of a metal catalyst.
(a) The balanced equation for the coupling reaction of bromobenzene on the metal surface to form biphenyl is:
2C₆H₅Br + 2Na → (C₆H₅)₂ + 2NaBr
(b) The balanced equations for the reactions of phenylmagnesium bromide and trityl fluoborate with water are:
PhMgBr + H₂O → PhH + MgBrOH
Trityl fluoborate + H₂O → Trityl alcohol + HBF₄
Therefore, the balanced equations are given above.
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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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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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the mixing entropy formula derived in the previous problem actually applies to any ideal gas, and to some dense gases, liquids, and solids as well. for the denser systems, we have to assume ____
For the denser systems, we have to assume ideal mixture.
What does optimal gas mixing entropy mean?
In the special situation of ideal gases, this constant volume type of "mixing" is referred to in what is occasionally referred to as Gibbs' theorem. It claims that such a "mixing" of ideal gases has no entropy.
The mixing entropy formula discovered in the preceding issue can be used to calculate the mixing entropy of any ideal gas as well as some dense gases, liquids, and solids. We must assume for the denser systems that the two kinds of molecules are the same size and interact with one another similarly to molecules of the same type (same forces, etc.). An ideal mixture is the name given to such a setup.
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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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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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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
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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Jen makes a Venn diagram to compare active transport and passive transport.
Which label belongs in the region marked X?
Moves molecules
Uses energy
Moves from low concentration to high concentration
Moves from high concentration to low concentration
The label that belongs in the region marked X is "Moves molecules" because both active transport and passive transport involve the movement of molecules across a cell membrane.
What differentiates the active and passive transport?Active transport and passive transport are two different mechanisms by which molecules move across a cell membrane. The key differences between active and passive transport are:
Energy requirement: Active transport requires energy, usually in the form of ATP, to move molecules across the cell membrane. In contrast, passive transport does not require energy and moves molecules down their concentration gradient.
Concentration gradient: Active transport moves molecules against their concentration gradient, from an area of low concentration to an area of high concentration, while passive transport moves molecules down their concentration gradient, or the change in concentration from one place with high concentration to another.
Specificity: Active transport often involves carrier proteins or pumps that are specific to certain molecules or ions, whereas passive transport usually involves channels or transporters that are less specific.
Rate of transport: Active transport can move molecules at a faster rate than passive transport, which is limited by the diffusion rate across the membrane.
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The diagram for question is attached below:
How many molecules are in 38.8g of C4H8O2?
Please Mark Brainliest Answer
To calculate the number of molecules in a substance, we need to know the mass of the substance and its molar mass, and use the Avogadro's number.
The molar mass of C4H8O2 can be calculated by adding the atomic masses of all the atoms in the molecule. The atomic masses of C, H, and O are approximately 12, 1, and 16 respectively. So,
Molar mass of C4H8O2 = (4 × 12.01 g/mol) + (8 × 1.01 g/mol) + (2 × 16.00 g/mol)
= 72.10 g/mol
Now, we can use the following formula to calculate the number of molecules in 38.8 g of C4H8O2:
Number of molecules = (mass of substance / molar mass) x Avogadro's number
where Avogadro's number is approximately 6.022 × 10^23 molecules per mole.
Substituting the values, we get:
Number of molecules = (38.8 g / 72.10 g/mol) x (6.022 × 10^23 molecules/mol)
= 1.03 × 10^23 molecules
Therefore, there are approximately 1.03 × 10^23 molecules in 38.8 g of C4H8O2.
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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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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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WILL MAKE BRAINLIEST!! PLEASE HELP!!
1. Calculate the Hf for the reaction.
CS2(l) + 2H2O (l) CO2(g) + 2H2S(g)
2. Since you now know the Hf of this reaction, please indicate whether it is an endothermic or an exothermic reaction and why you chose your answer.
The answer is:
ΔHf = -109.2 kJ/molThe reaction is exothermic because the ΔHf value is negative.Question attached Below:
142.20 is the boiling point of a solution made of 75.4g of urea (CH,N₂O) dissolved in 800. g of X.
What is boiling point?Boiling point is the temperature at which a liquid boils and turns into a vapor. At the boiling point, the vapor pressure of the liquid is equal to the atmospheric pressure. The boiling point of a liquid is usually higher than its melting point, and the two points have different values for different substances.
The boiling point elevation of the solution can be calculated using the following equation:
ΔT = K*m
where K is the boiling point elevation constant and m is the molality of the solution.
To calculate the molality of the solution, we first need to calculate the moles of urea present in 75.4g.
75.4g of urea has a molar mass of 60.06 g/mol, so 75.4g of urea contains 1.25 moles.
Now, we can calculate the molality of the solution.
800 g of liquid X weighs 800 g/mol, so 800 g of liquid X contains 800 moles.
Therefore, the molality of the solution is 1.25 moles/800 moles, or 0.00156 moles/mol.
Now, we can calculate the boiling point elevation of the solution:
ΔT = K*m
ΔT = -2.43°C-kg-mol * 0.00156 moles/mol
ΔT = -0.038 °C
Therefore, the boiling point of the solution is 142.20.
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