For a first-order reaction `A rarr B` the reaction rate at reactant concentration of `0.10 M` is found to be `2.0 xx 10^(-5) "mol" L^(-1) s^(-1)`. The half-life period of the reaction is

Options

A. 300 s
B. 30 s
C. 220 s
D. 347 s

Answer

D

Explanation

Rate `= k[A]` i.e., `2.0xx10^(-5)=k(0.01)`
or `k=2.0xx10^(-3):.t_(1//2)=(0.693)/(2.0xx10^(-3))=347 s`.