Question

The rate constant of the reaction $A\to B$ is $0.6\times {10}^{-3}$ mole per second. If the concentration of B after 20 min is:

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

Answer 1

The correct option is D

0.72 M

For a zero-order reaction unit of rate constant is mole per second. Hence, we can easily calculate the concentration of B after 20 min by the following formula,

X =Kt

$X=Kt=0.6\times {10}^{-3}\times 20\times 60=0.72M$