Chemistry - Chemical Kinetics Question with Solution | TestHub

The unit of the rate constant $k$ is ${\mathrm{s}}^{-1}$.

The general unit for the rate constant of an $n$-th order reaction is $(\mathrm{mol}{\mathrm{L}}^{-1}{)}^{1-n}{\mathrm{s}}^{-1}$.

For $n=1$, the unit is $(\mathrm{mol}{\mathrm{L}}^{-1}{)}^{1-1}{\mathrm{s}}^{-1}={\mathrm{s}}^{-1}$.

Since the given rate constant has the unit ${\mathrm{s}}^{-1}$, the reaction is of first order.

Answer: 1