A first order reaction takes 40 minutes for 30% decomposition. Calculate its half life.

In a first order reaction 60% of the reactant decomposes in 45minutes.Calculate the half life for the reaction.

A first order reaction requires 30 minutes for 50 % completion . The time required to complete the reaction by 75 % will be __.

A first order takes 30 minutes to complete 20%. Calculate the rate constant for the reaction.

The half life of a first order reaction is 900 min at 820 K.Estimate its half life at 720 K if the energy of activation of the reaction is 250 kJ mol^(-1)

For a first order reaction, the ratio of time for the completion of 99.9% and half of the reaction is

A first order reaction was started with a decimolar solution of the reactant , 8 minutes 20 seconds later its concentration was found to be M/100. So the rate constant of the reaction is ___ .