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

Answer

C

Explanation

c) The units of rate constant suggest that the reaction is of zero order. The reaction rate is independent of concentration.
Concentration of B `=k xxt`
`=(0.6 xx 10^(-3) mol L^(-1)s^(-1)) xx (20 xx 60)s`
`=0.72 mol L^(-1) = 0.72M`.