A first order reaction takes `69.3` minutes for `50%` completion. How much time will be needed for `80%` completion?

Derive the expression for first order rate constant. A first order reaction takes 69.3 min for 50% completion. How long will it take for 80% completion?

A first order reaction taken 45.4 minutes for 50% completion. How much time will it take for 60% completion ?

A first order reaction taken 16 minutes for 50% completion. How much time will it take for 75% completion ?

A first order reaction taken 32 minutes for 50% completion. Hew much time will it take for 90% completion ?

A first order reaction takes 69.3 minutes for 50% completion. Calculate the time required for 80% completion of the reaction.