Initial conc. \(A_{0}=0.1\, M\)
Conc. After \(5 \min A_{t}=0.001\, M\) \(t =5\, min\).
For first order reaction
\(K =\frac{2.303}{t} \log \left(\frac{A_{0}}{A_{t}}\right)\)
\(=\frac{2.303}{5} \log \left(\frac{0.1}{0.001}\right)\)
\(K =0.9212 \,\min ^{-1}\)
[અહી આપેલ $\left.\log _{10} 2=0.3010\right]$