The half life period of a first order reaction is 50 min. In what time will it go to 90% completion ?

The hydrolysis of an ester in acid medium is first order reaction. Half life period of a first order reaction is 20 seconds. How much time will it take to complete 90% of the reaction?

The half life period of a first order reaction is 60 min. What percentage will be left after 240 min.

The half life period of a first order reaction is 60 min. What percentage will be left after 240 min.

The half-life period of a first order reaction is 60 min. What percentage will be left after 120 minutes?

The half life of a first order reaction is 100 seconds. What is the time required for 90% completion of the reaction?

If the half life of a first order reaction is 60 min, the approximate time in min, required to complete 90% of the reaction is (log2=0.3)