If $75 \%$ of a first order reaction was completed in 60 minutes, $50 \%$ of the same reaction under

Question

If $75 \%$ of a first order reaction was completed in 60 minutes, $50 \%$ of the same reaction under the same conditions would be completed in

Professor PC Thomas Classes · Answer

For first order, $75\%$ completion is $2 	imes t_{1/2}$. \So $2 	imes t_{1/2} = 60 \implies t_{1/2} (50\% 	ext{ completion}) = 30 	ext{ min}$.