Question

If 75% of a first order reaction completed in 15 min then 90% of same reaction completed in

Answer 1

15 min = 75 % reacton

1 min = 75/15 % of reaction

1 min = 5 %

therefore in 1 min 5 % reaction is completed..

Now to find time taken in 90% reaction

= 90/5 min

= 18 minutes
#Answer