First slide
First order reactions
Question

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

Easy
Solution

 For 1st  order reaction,  t=2.303klogaa-x=2.303klog100100-99 =2.303klog102=2.303k×2×log10=4.606k

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