Question

For a first order reaction, show that time required for 99% completion is twice the time required for the completion of 90% of reaction.

Answer 1

For a first order reaction, the time required for 99% completion is

For a first order reaction, the time required for 90% completion is

Hence, the time required for 99% completion of a first order reaction is twice the time required for the completion of 90% of the reaction.