The rate constant for a first order reaction Is 90 `s^-1` .How much time will it take to reduce the concentration of the reactant to `1/20^(th)` of its Initial value ?

Explanation

`k = 90 sec^(-1)`
`t = (2.303)/90 "log" 20`
`t = 3.33 xx 10^(-2) "sec"`