A first order reaction is 75% completed in 100 minutes. How long time will it take for its 87.5% completion?

A first order reaction is 75% completed in 72 min. How long time will it take for (i) 50% completion (ii) 87.5% completion

A first order reaction is 25% completing 30 minutes. How long will it take for its 75% completion ?

A first order reaction is 15% complete in 20 minutes. How long will it take to complete 20%.

A first order reaction is 15% complete in 20 minutes. How long will it take to complete 60%?

A first order reaction is 15 % complete in 20 minutes. How long will it takes to complete 20 %.

A first order reaction is 15% complete in 20 minutes. How long will it take to be 60% complete.

40% of a first order reaction is completed in 50 minutes. How much time will it take for the completion of 80% of this reaction?

A first order reaction is 40%. Complete in 50 minute. How long will it take to 80% complete.