Question

The rate constant of the reaction $A\to B$ is $0.6\times {10}^3$ mole per litre per second. If the concentration of A is 5M, then concentration of B after 30 minutes is

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

Answer 1

The correct option is B 0.72 M

Order of reaction is zero as unit rate constant is mole per second.
$\therefore \frac{[A{]}_0-[A]}{t}\Rightarrow 0.6\times {10}^{-3}=\frac{5-\left[A\right]}{20\times 60}$
$\therefore$ [A] = 5 - 0.72
$\therefore$ Concentration of B after 20 minutes is 0.72 M