What is Half life of a reaction ?

The rate constant for a first order reaction is 7.0xx10^(-4) s^(-1) . If initial concentration of reactant is 0.080 M, what is the half life of reaction ?

The rate constant for a first order reaction is 7.0xx10^(-4) s^(-1) . If initial concentration of reactant is 0.080 M, what is the half life of reaction ?

In a first order reaction, the concentration of reactant decreases from 20 mmol dm^(-3) to 8 mmol dm^(-3) in 38 minutes. What is the half life of reaction?

The rate constant for a first order reaction is 7.5 xx 10^(-4) s^(-1) . If initial concentration of reactant is 0.080 M , what is the half life of reaction ?

The rate constant for a first order reaction is 5.0×10^(−4)s^(−1) .If initial concentration of reactant is 0.080 M, what is the half life of reaction?