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Cell Potential

Q. What is the value of the equilibrium constant for the cell reaction below at 25°C? 2Cr(s) + 3Pb2+(aq) ⇌ 3PB(s) + 2Cr3+(aq) E°cell = 0.61 V

Solved • Jun 18, 2019

Faraday's Constant

Q. Copper is electroplated from CuSO4 solution. A constant current of 4.39 A is applied by an external power supply. How long will it take to deposit 1.00x10^2 g of Cu? The atomic mass of copper is 63.546.

Solved • Jun 18, 2019

Average Rate of Reaction

Q. The oxidation of ammonia produces nitrogen and water via the reaction 4NH3 + 3O2 → 2N2 + 6H2O. If the rate of formation of N2 is 2.0 mol/(L • s), then the rate at which a. H2O is being formed is 2.0 mol/(L • s). b. NH3 reacts is 4.0 mol/(L • s). c. O2 reacts is 1.5 mol/(L • s). d. NH3 reacts is 0.50 mol/(L • s). e. H2O is being formed is 0.67 mol/(L • s).

Solved • Jun 18, 2019

Rate Law

Q. The experimental rate law is a. rate = k[NO]. b. rate = k[NO]1/2[Cl2]. c. rate = k[NO][Cl2]1/2. d. rate = k[NO]2[Cl2]. e. rate = k[NO][Cl2].

Solved • Jun 18, 2019

Rate Law

Q. From a consideration of the following reaction system 2H2S(g) + O2(g) → 2S(s) + 2H2O(g) we can conclude that a. the reaction is second order in H2S and first order in O2. b. the reaction is first order in H2S and second order in O2. c. rate = k[H2S]2[O2]. d. rate = k[H2S][O2]. e. None of these conclusions are justified.

Solved • Jun 18, 2019

Catalyst

Q. The addition of a catalyst in a chemical reaction (A) increases the concentration of products at equilibrium. (B) increases the fraction of reactant molecules with a given kinetic energy. (C) provides an alternate path with a different activation energy. (D) lowers the enthalpy change in the overall reaction.

Solved • Jun 18, 2019

Le Chatelier's Principle

Q. Given that 1 2SO2(g) +O2(g) →← 2SO3(g) 2 The forward reaction (1) is proceeding at a certain rate at some temperature and pressure; when the pressure is increased, we may expect for the forward reaction (1)

Solved • Jun 18, 2019