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The rate of a reaction decreased by 3....

The rate of a reaction decreased by 3.555 times when the temperature was changed from `40^(@)C ` to `30^(@)C` . The activation energy (in kj `mol^(-1)`) of the reaction is ______.
Take : R = 8314 J `mol^(-k) ` `K^(-1)` In 3.555 = 1268

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