Question 3.45: Given the following information about two reactions, which o......

Organic Chemistry Study Guide: Key Concepts, Problems, and Solutions [1424398]

Given the following information about two reactions, which one will occur at the faster rate at a common temperature?
Reaction $ΔH^o_{rxn}$ $E_a$
A → X –120 kJ mole $^{−1}$ +100 kJ mole $^{−1}$
B → Y –100 kJ mole $^{−1}$ +120 kJ mole $^{−1}$

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The reaction converting A to X has the lower activation energy ( $E_a$ ), so it proceeds at the faster rate.

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