A first order reaction is $20 \%$ complete in $10 \mathrm{~min}$. The rate constant of the reaction is

Question

Aicharya · Accepted Answer

$\log \frac{[\mathrm{A}]_{t}}{[\mathrm{~A}]_{0}}=-\frac{k}{2.303} t \quad$ i.e. $\quad \log 0.8 \quad=-\frac{k}{2.303}(10 \mathrm{~min})$
or $\quad k=-\frac{2.303}{10 \min } \log (0.8)=0.0223 \mathrm{~min}^{-1}$

A first order reaction is $20 \%$ complete in $10 \mathrm{~min}$. The rate constant of the reaction is

Solution