# If the rate constant for a first order reaction is k, the time (t) required for the completion of 99% of the reaction

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If the rate constant for a first order reaction is k, the time (t) required for the completion of 99% of the reaction is given by:

(1) t = 0.693/k

(2) t = 6.909/k

(3) t = 4.606/k

(4) t = 2.303/k
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Chemical kinetics