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Write the rate law for a first order reaction. Justify the statement that half life for a first order reaction is independent of the initial concentration of the reactant.

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For a fust order reaction

[R] = conc. after time t

When half of the reaction is completed, [R] = [R]0/2 Representing, the time taken for half of the reaction to be completed,by t1/2 , equation becomes :

The above equation shows that half life first order reaction is independent of the initial concentration of the reactant.

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