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Chem 235 Recitation Worksheet #5: Reactions Approaching Equilibria
1. The half-lives for the following first-order reactions are given above each arrow:
13 𝑚𝑠
𝐴→
𝐵
17 𝑚𝑠
𝐵→
𝐴
Calculate the relaxation time for the system to return to equilibrium after a temperature
jump.
2. Consider a reaction 𝐴 ⇌ 2𝐵 that is first-order in the forward direction and second-order
in the reverse direction. The initial rate of the forward reaction was found to be 0.01 M/s
for [𝐴]0 = 0.80 𝑀, and the equilibrium constant is 11.25.
a) Calculate the rate constant of the forward reaction.
b) Calculate the rate constant of the reverse reaction.