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A 1st order reaction is 50% complete in ...

A 1st order reaction is 50% complete in 30 minute at `27^(@)C` and in `10` minute at `47^(@)C`. Calculate the:
(a) Rate constant for reaction at `27^(@)C` and `47^(@)C`.
(b) Energy of activation for the reaction.
(c ) Energy of activation for the reverse reaction if heat of reaction is `-50 kJ mol^(-1)`.

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