Question

The initial rate of zero-order reaction of the gaseous equation $A$ (g) $\to$ $2B$ (g) is 10${}^{-2}$ M min${}^{-1}$ if the initial concentration of $A$ is 0.1 M. What would be a concentration of $B$ after $60$ seconds?

• A. $0.09M$
• B. $0.01M$
• C. $0.02M$
• D. $0.03M$

Answer 1

The correct option is C $0.02M$

For a zero order reaction, the rate law expression is $R=k[A{]}^0=k={10}^{-2}$
$t=60s=1min$
$\left[A_0\right]-\left[A\right]=Kt$
$0.1-\left[A\right]={10}^{-2}\times 1$
$\left[A\right]=0.09M$
$\left[B\right]=2\left[A\right]$

$=2(0.1-0.09)$

$=0.02M$