The half life a first order reaction is1.7hr.How long will it take for 20% of the reactant to react?

The half life of a first order reaction is 10 years . The time taken by 10 g of the reactant to reduce its half is ______.

The half life of a first order reaction is 0.5 min. Calculate time needed for the reactant to reduce to 20% and the amount decomposed in 55s.

The rate constant of a first order reaction is 6.8xx10^(-4)s^(-1) . If the initial concentration of the reactant is 0.04 M, what is its molarity after 20 minutes? How long will it take for 25% of the reactant to react?

The half-life period of any first order reaction:

Half life period of a zero order reaction is

The half life of first order reaction is 990 s. If the initial concentration of the reactant is 0.08 mol dm^3 , what concentration would remain after 35 minutes?