Question

In the following reaction, $A\to B$, rate constant is $1.2\times {10}^{-2}M{s}^{-1}$. What is concentration of B after 10 min, if we start with 10 M of A?

• A. 7.2 M
• B. 14.4 M
• C. 3.6 M
• D. None of these

Answer 1

The correct option is A 7.2 M

$k=1.2\times {10}^{–2}M{s}^{–1}$

Since unit of rate constant is $M{s}^{–1}$, it is zero order

reaction

Rate law $\left[B\right]=kt$

At t = 10 min

$\left[B\right]=1.2\times {10}^{–2}\times 10\times 60M$

$\left[B\right]=7.2M$