The rate constant of the reaction `A rarr B` is `0.6 xx 10^(-3)` mole per second. If the concentration of `A` is `5 M`, then concentration of `B` after `20` minutes is:

Options

A. 1.08 M
B. 3.60 M
C. 0.36 M
D. 0.72 M

Answer

D

Explanation

Rate constant `k = 0.6 xx 10^(-3)` mole per second. (unit mole per second shows zero order reaction) For a zero order reaction
`[A] = [A]_(0)-kt`
and `[A_(0)]-[A] =[B]=kt`
`=0.6 xx 10^(-3) xx 20 xx 60 = 0.72 M`