Ch.15 - Chemical Equilibrium
Chapter 15, Problem 137
Which of the following relative values of kf and kr results in an equilibrium mixture that contains large amounts of reactants and small amounts of products? (a) kf 7 kr (b) kf = kr (c) kf 6 kr
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Related Practice
Textbook Question
A platinum catalyst is used in automobile catalytic convert- ers to hasten the oxidation of carbon monoxide:
2 CO1g2 + O 1g2 ∆Pt 2 CO 1g2 ΔH° = - 566 kJ
Suppose that you have a reaction vessel containing an equilibrium mixture of CO1g2, O21g2, and CO21g2. Under the following conditions, will the amount of CO increase, decrease, or remain the same?
(e) The pressure is increased by adding O2 gas.
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Textbook Question
For the reaction A2 + 2B ∆ 2 AB, the rate of the for- ward reaction is 18 M/s and the rate of the reverse reaction is 12 M/s. The reaction is not at equilibrium. Will the reaction pro-
ceed in the forward or reverse direction to attain equilibrium?
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Textbook Question
Consider a general, single-step reaction of the type A + B ∆ C. Show that the equilibrium constant is equal to the ratio of the rate constants for the forward and reverse reactions, Kc = kf>kr.
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Textbook Question
Consider the reaction of chloromethane with OH- in aque- ous solution:
CH Cl1aq2 + OH-1aq2 ∆kf CH OH1aq2 + Cl-1aq2
At 25 °C, the rate constant for the forward reaction is 6 * 10-6 M-1 s-1, and the equilibrium constant Kc is 1 * 1016. Calculate the rate constant for the reverse reac- tion at 25 °C.
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Textbook Question
In automobile catalytic converters, the air pollutant nitric oxide is converted to nitrogen and oxygen. Listed in the table are forward and reverse rate constants for the reac- tion 2 NO1g2 ∆ N21g2 + O21g2. Temperature (K) kf1M — 1 s-12 kr1M-1 s — 12
1400 0.29 1.1 * 10-6
1500 1.3 1.4 * 10-5
Is the reaction endothermic or exothermic? Explain in terms of kinetics.
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Textbook Question
Given the Arrhenius equation, k = Ae-Ea>RT, and the rela-
tion between the equilibrium constant and the forward and
reverse rate constants, Kc = kf>kr, explain why Kc for an exothermic reaction decreases with increasing temperature.
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