What is rate constant of a first order reaction if time required to decrease concentration of reactant from $1.6 \mathrm{M}$ to $0.4 \mathrm{M}$ is 12 hours?

Question

Aicharya · Accepted Answer

We know $\begin{aligned} \mathrm{K} & =\frac{2.303}{\mathrm{t}} \log \frac{\mathrm{a}_0}{\mathrm{a}_{\mathrm{t}}} \ & =\frac{2.303}{12} \log \frac{1.6}{0.4} \ & =\frac{2.303}{12} \log ^4 \ & =\frac{2.303}{12} 	imes 2 \log ^2 \ & =0.115\end{aligned}$

What is rate constant of a first order reaction if time required to decrease concentration of reactant from…

Solution