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The temperature dependence of rate constant (k) of a chemical reaction is written in terms of Arrhenius equation, k = Ae⁻Ea/RT. Activation energy (Ea) of the reaction can be calculated by plotting:

1. log k vs 1/log T
2. k vs T
3. k vs 1/log T
4. log k vs 1/T

Correct answer: log k vs 1/T

Solution

The Arrhenius equation can be linearized as log k = -Ea/(2.303R)(1/T) + log A. A plot of log k vs 1/T gives a straight line with slope -Ea/(2.303R), allowing the calculation of Ea.

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