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

Answer

B

Explanation

Zero order reaction
x=kt
`x=0.6xx10^(-3)xx20xx60`
`=72xx10^(-2)`
x=0.72M
`{:(,Ato,B),("Initial case",5,0),("After 20 min.",5-x,x):}`
So, [B]=x=0.72M