Answer to Question #64273 in Physical Chemistry for divine

Question

For a certain first order reaction the half life is 100 seconds. How long will the action take for the reaction to be 75% complete?

Answer 1

In the first 100 seconds 50% of reagent will decay. In the next 100 seconds also 50% of reagent residue will decay. So it need 200 seconds for reaction to be 75% complete.