A first order reaction is half completed in 45 minutes.The time required to complete 99.9% of the reaction

20% first order reaction is completed in "50" minutes.Time required for the completion of 60% of the reaction is

A first order reaction is 40% completed in 50 minutes. What is the time required for 90% of the reaction to complete?

A first order reaction completes 60% 20 minutes. The time required for the completion of 90% of the reaction is approx………..

A first order reaction is half completed in 45 minutes. How long does it need 99.9% of the reaction to be completed

Half life of a first order reaction is 69.3 minutes. Time required to complete 99.9% of the reaction will be :