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If k is the rate constant of a reaction at temperature T, then the value of the limit of log k as T -> infinity is:

1. A/2.303
2. A
3. 2.303 A
4. log A

Correct answer: log A

Solution

From Arrhenius, log k = log A - Ea/(2.303 RT). As T -> infinity the second term vanishes, so log k -> log A.

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