The rate constant of a first order reaction is doubled when the temperature is increased from 200C to 250C. How many times the rate constant will increase if the temperature is raised from 200C to 400C is_______

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The rate constant of a first order reaction is doubled when the temperature is increased from 20⁰C to 25⁰C. How many times the rate constant will increase if the temperature is raised from 20⁰C to 40⁰C is_______

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answer is 16.

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For every 5^o rise in temperature, the rate constant becomes double.

∴ For 20 ^oC (5×4 times) rise in temperature, the rate constant, k= 2⁴=16.

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