Half-life of a first order reaction is 5 min. The concentration of reactant after 30 min if its initial concentration is 128 mmol L-1 is

Half-life of a first order reaction is 5 min. The concentration of reactant after 30 min if its initial concentration is 128 mmol L-1 is

  1. A

    128mmol L-1/24

  2. B

    128mmol L-1/25

  3. C

    128mmol L-1)/26

  4. D

    128 mmol L-1/27

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    Solution:

    30 min is equal to six times the half-life of 5 min. Hence, the concentration will be reduced by 26 times.

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