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

Answer

A

Explanation

Reaction is of zero order as the unit of rate constant is mol `" L"^(-1) " s"^(-1)`.
`therefore` Concentration of `B =k xx t = 0.6 xx 10^(-3) xx 20 xx 60 = 0.72` M