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Chemistry 102
July 2023
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Chemistry 102 Q&A Archive of July 23, 2023

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July 23 of 2023

Question 7 What is the expected freezing point of a solution made by dissolving 13.49g of lithium sulfate in 81.00mL of water? The freezing point depression constant for water is 1.86°C/molal. Report your answer in units of "degC". Question 6 The enthalpy of fusion for aluminum metal…

Consider the following molecules. Which of the following statements is correct? I II III IV I and II are diastereomers I is a meso compound III and IV are enantiomers III and IV are diasteremers

Select the correct name for the following compound?

Question 8 What is the expected freezing point of a solution made by dissolving 12.59g of potassium chlorate in 68.00mL of water? The freezing point depression constant for water is 1.86°C/molal. Report your answer in units of "degC". Question 9 You have prepared a sulfate solution by…

How many chiral carbons are there in the compound shown?

Question 15. You are studying the kinetics of a reaction in which alanine reacts to form an N-oxide derivative. When the initial concentration of alanine is 1.342M, the reaction rate is 3.774E-4 M/min. If the initial concentration of alanine is 2.684M, the rate increases to 7.548E-4 M/min.…

23. You are studying the reaction: 2 A + B + 3 C --> D + 4 E If the rate is 4.37 M/min with respect to [A], what is the rate with respect to E? Question 24. The enthalpy of vaporization for lead is 178kJ/mol. How much heat is required to vaporize 4.35g of lead liquid at its…

What is the Kp value of: 4 Fe(s) + 3 O2 (g) ⇌ 2 Fe2O3(s). The Kc value is 1.0x10^9 and the temperature is 2000.0 C.

29. Your lab is studying the decomposition of potassium thiocyanate in aqueous solution. At 24.29°C, you find that the rate law constant is 0.449 M-2min-1. One of your labmates has found that at 15.33°C the rate law constant is 0.0527 M-2min-1. What is the activation energy for this reaction?…

You have prepared a solution by dissolving 74.27mg of sucrose (table sugar, C12H22O11) in 1.55kg of water. What is this solution's sucrose concentration in parts per million, ppm?

Which of the following are characteristics that define a solution? Choose all correct answers. 4 options: The solvent is the major component of a solution The solvent in a solution must be a liquid The dissolved solute in a solution will settle out if the solution is not…

You have prepared an aqueous iron(III) solution by diluting 11.00mL of 6.79M iron(III) nitrate aqueous solution to a total volume of 235.0mL by adding water. What is the iron(III) ion concentration (in units of M) in this new solution?

how to prepare a buffer based on this composition 75 mM Tris-HCl (pH 8) 300 mM NaCl 5 mM Dithiothreitol (DTT) 10% (v/v) glycerol

You have prepared an aqueous iron(III) solution by diluting 11.00mL of 6.79M iron(III) nitrate aqueous solution to a total volume of 235.0mL by adding water. What is the iron(III) ion concentration (in units of M) in this new solution?

You are studying the reaction: A(aq) ↔ 3 B(aq) The value of Kc for this reaction is 12.89. When the reaction reaches equilibrium, you find [B]eq=0.659M. What is [A]eq? Report your answer to 3 decimal places.

For the following equilibrium constant values, determine whether the equilibrium is reactant-favored, product-favored, or neither. Question 8…

You are studying the reaction: A(aq) ↔ 3 B(aq) The value of Kc for this reaction is 12.89. When the reaction reaches equilibrium, you find [B]eq=0.659M. What is [A]eq? Report your answer to 3 decimal places.

Which of the following solutions, when mixed in equal volumes, will create a reasonably effective buffer solution? Select as many answers as appropriate however points will be deducted for incorrect guesses. a) 0.100 M HCOOH and 0.100 M HCOO- b)0.200 M NaOH and 0.100 M HCOOH c)0.100 M HCl…

A(aq) ↔ B(aq) The value of Kc for this reaction is 0.785. When the reaction reaches equilibrium, you find [A]eq=0.147M. What is [B]eq? Report your answer to 3 decimal places.

You are studying the reaction: 2 A(aq) + B(aq) ↔ 2 C(aq) + D(aq) When the reaction reaches equilibrium, you find [A]eq=0.299M, [B]eq=0.343M, [C]eq=0.667M, and [D]eq=0.783M . What is the value of Kc for this reaction? Report your answer to 2 decimal places.

When the reaction reaches equilibrium, you find [A]eq=0.167M and [B]eq=0.613M. What is the value of Kc for this reaction? Report your answer to 2 decimal places.

You are studying the reaction: A(aq) ↔ 2 B(aq) When the reaction reaches equilibrium, you find [A]eq=0.299M and [B]eq=0.705M. What is the value of Kc for this reaction?

You are studying the reaction: A(aq) ↔ 3 B(aq) The value of Kc for this reaction is 0.649. When the reaction reaches equilibrium, you find [A]eq=0.235M. What is [B]eq? Report your answer to 3 decimal places.

Your lab is studying the decomposition of potassium thiocyanate in aqueous solution. At 22.67°C, you find that the rate law constant is 0.423 M-2min-1. One of your labmates has found that at 13.95°C the rate law constant is 0.0545 M-2min-1. What is the activation energy for this reaction?…

You are studying the kinetics of a reaction in which alanine reacts to form an N-oxide derivative. When the initial concentration of alanine is 1.342M, the reaction rate is 3.774E-4 M/min. If the initial concentration of alanine is 2.684M, the rate increases to 7.548E-4 M/min. What is the order…

A reaction is found to be 1st order with respect to carbonate ion. If the initial concentration of carbonate ion is 0.887M and the rate law constant is 0.0265 M/sec, how many seconds must pass before the concentration of carbonate ion drops to 0.309M?

A reaction is found to be 1st order with respect to ammonium ion. If the concentration of ammonium ion is 0.153M after 22.7 seconds have passed, and the rate law constant is 0.0207 M/sec, what was the initial concentration of ammonium ion?

You are going for a walk in the park. For the first 70.41 minutes, you are feeling rather energetic and walk at a rate of 4.31 miles per hour. Suddenly, a ferocious looking butterfly starts chasing you so you run for a couple minutes as fast as you can. Having escaped the vicious butterfly, you…

A sealed 2.0 -L container initially contains 0.12 mol each of H2O(g),Cl2O(g), and HClO(g); the reaction mixture is allowed to come to equilibrium according to the reaction H2O(g)+Cl2O(g)⇌2HClO(g)Kc=0.090 Calculate the equilibrium concentrations of all three compounds. The present…

You have found the following: CaSO4(s) <=> Ca+2(aq) + SO4-2(aq) K = (6.076x10^-5) What is the value of K for the following reaction? 2 CaSO4(s) <=> 2 Ca+2(aq) + 2 SO4-2(aq)

You have found the following: HNO2(aq) + H2O(l) <=> H3O+(aq) + NO2-(aq) K = (4.632x10^-4) What is the value of K for the following reaction? H3O+(aq) + NO2-(aq) <=> HNO2(aq) + H2O(l)

the pH of 0.01M of ethanoic acid is 3.4 .what is the dissociation constant of ethanoic acid .

You have found the following: HNO2(aq) + H2O(l) <=> H3O+(aq) + NO2-(aq) K = (4.632x10^-4) What is the value of K for the following reaction? H3O+(aq) + NO2-(aq) <=> HNO2(aq) + H2O(l)

What is the concentration of lead(II) ions in a saturated solution of lead(II) fluoride? Ksp(PbF2) = (3.989x10^-8)

You have found the following: NH3(aq) + H2O(l) <=> OH-(aq) + NH4+(aq) K = (1.81860x10^-5) OH-(aq) + H+(aq) <=> H2O(l) K = (1.059x10^14) What is the value of K for the following reaction? NH3(aq) + H+(aq) <=> NH4+(aq)

Estimate the magnitude of the dipole moment of water in Debye units, trating water as three point charges. Assume the O-H distance is 1.00 A, and the angle H-O-H is 104°. The charges of Hydrogens are +0.5e and Oxygen is -1.0e, where e = proton charge. Hint: you will have to use your trig to…

You are studying the reaction of feldomite with anicium and dolomide in the hopes of developing a new fuel. You have performed the following experiments at 27.34°C: Exp’t # [feldomite]initial [anicium]initial [dolomide]initial Rateinitial (M/second) 1 0.963 0.224 0.422 6.495x10-5 …

A steam table chart may be used for parts a-e. Use a steam table chart. Consider a Rankine cycle driven by steam as the working fluid. The cycle features heat rejection to a condenser, given by Pcondenser as assigned in the table below. Heat is received into the cycle at P0 assigned in the…

Why highly exothermic processes tend to be spontaneous? Under what conditions will a highly exothermic process be non-spontaneous? Can you explain in terms of entropy of the universe, system and surroundings?

2. For each of the following pairs of half-cells: a. Write a balanced chemical equation for each half-reaction and the overall reaction. b. Determine \( \mathrm{E}^{\circ} \) eed for the reaction. c. Is the cell spontaneous as written? d. Calculate \( \Delta \mathrm{G}^{\circ} \mathrm{ra} \)…

For each of the following pairs of half-cells: a. Write a balanced chemical equation for each half-reaction and the overall reaction. b. Determine E°cell for the reaction. c. Is the cell spontaneous as written? d. Calculate ΔG°rxn for the cell reaction. Anode: Al(s)  Al+3(aq) Ered =…

What is the concentration of silver(I) ions in a saturated solution of silver(I) sulfate? Ksp(Ag2SO4) = (1.234x10^-5)

Show using the concept of cell potential to demonstrate the following: gold is insoluble in muriatic acid (assume that H+ in muriatic acid is 1.0 M)

2. You have been studying the following gas-phase reaction, hydrolysis of methyl acetate: CH3COOCH3(g) + H2O(g)  CH3COOH(g) + CH3OH(g) Under some set of conditions, you prepared a mixture with [CH3COOCH3]initial = 0.2319M and [H2O]initial =0.1615M. After the reaction reaches…

Show using the concept of cell potential to demonstrate the following: a. acidified MnO4– can be used to titrate H2O2 in a commercial sample of Aqua Oxigenada. what is the E cell potential?

Select the correct name for the following compound below

what happens to freezing and boiling point of water if calcium chloride or insoluble impurity is added into it.

At a certain temperature, Kc is 5.23 x 10 ^-3 for the equilibrium: 3 A (g)---> B (g) + C (g) What are the concentrations of B (g) and C (g) in equilibrium with 0.562 M of A (g) ? 9.64 x 10^-4 M 4.64 x 10 ^-7 M 1.45x10^ -4 M 9.28 x 10^-7 M None of the above

Consider the following molecules. Which of the following statements is correct? I II III IV I and II are diastereomers I is a meso compound III and IV are enantiomers III and IV are diasteremers

Select the correct name for the following compound?

How many chiral carbons are there in the compound shown?

23. You are studying the reaction: 2 A + B + 3 C --> D + 4 E If the rate is 4.37 M/min with respect to [A], what is the rate with respect to E? Question 24. The enthalpy of vaporization for lead is 178kJ/mol. How much heat is required to vaporize 4.35g of lead liquid at its…

What is the Kp value of: 4 Fe(s) + 3 O2 (g) ⇌ 2 Fe2O3(s). The Kc value is 1.0x10^9 and the temperature is 2000.0 C.

You have prepared a solution by dissolving 74.27mg of sucrose (table sugar, C12H22O11) in 1.55kg of water. What is this solution's sucrose concentration in parts per million, ppm?

You have prepared an aqueous iron(III) solution by diluting 11.00mL of 6.79M iron(III) nitrate aqueous solution to a total volume of 235.0mL by adding water. What is the iron(III) ion concentration (in units of M) in this new solution?

You are studying the reaction: A(aq) ↔ 3 B(aq) The value of Kc for this reaction is 12.89. When the reaction reaches equilibrium, you find [B]eq=0.659M. What is [A]eq? Report your answer to 3 decimal places.

A(aq) ↔ B(aq) The value of Kc for this reaction is 0.785. When the reaction reaches equilibrium, you find [A]eq=0.147M. What is [B]eq? Report your answer to 3 decimal places.

You are studying the reaction: 2 A(aq) + B(aq) ↔ 2 C(aq) + D(aq) When the reaction reaches equilibrium, you find [A]eq=0.299M, [B]eq=0.343M, [C]eq=0.667M, and [D]eq=0.783M . What is the value of Kc for this reaction? Report your answer to 2 decimal places.

You are studying the reaction: A(aq) ↔ 2 B(aq) When the reaction reaches equilibrium, you find [A]eq=0.299M and [B]eq=0.705M. What is the value of Kc for this reaction?

You are studying the reaction: A(aq) ↔ 3 B(aq) The value of Kc for this reaction is 0.649. When the reaction reaches equilibrium, you find [A]eq=0.235M. What is [B]eq? Report your answer to 3 decimal places.

A reaction is found to be 1st order with respect to ammonium ion. If the concentration of ammonium ion is 0.153M after 22.7 seconds have passed, and the rate law constant is 0.0207 M/sec, what was the initial concentration of ammonium ion?

You are going for a walk in the park. For the first 70.41 minutes, you are feeling rather energetic and walk at a rate of 4.31 miles per hour. Suddenly, a ferocious looking butterfly starts chasing you so you run for a couple minutes as fast as you can. Having escaped the vicious butterfly, you…

You have found the following: CaSO4(s) <=> Ca+2(aq) + SO4-2(aq) K = (6.076x10^-5) What is the value of K for the following reaction? 2 CaSO4(s) <=> 2 Ca+2(aq) + 2 SO4-2(aq)

You have found the following: HNO2(aq) + H2O(l) <=> H3O+(aq) + NO2-(aq) K = (4.632x10^-4) What is the value of K for the following reaction? H3O+(aq) + NO2-(aq) <=> HNO2(aq) + H2O(l)

What is the concentration of lead(II) ions in a saturated solution of lead(II) fluoride? Ksp(PbF2) = (3.989x10^-8)

What is the concentration of silver(I) ions in a saturated solution of silver(I) sulfate? Ksp(Ag2SO4) = (1.234x10^-5)

Show using the concept of cell potential to demonstrate the following: gold is insoluble in muriatic acid (assume that H+ in muriatic acid is 1.0 M)

At a certain temperature, Kc is 5.23 x 10 ^-3 for the equilibrium: 3 A (g)---> B (g) + C (g) What are the concentrations of B (g) and C (g) in equilibrium with 0.562 M of A (g) ? 9.64 x 10^-4 M 4.64 x 10 ^-7 M 1.45x10^ -4 M 9.28 x 10^-7 M None of the above