(A) follows first order reaction : A→ Products; concentration of A changes from 0.1 M to 0.025 M in 40 minutes. Find the rate of reaction of A when its concentration is 0.01 M.
3.47×10−4M min−1
Fraction remaining after 40 minutes
=0.0250.1=14=(12)2;Hence,2×t12=40⇒t12=20 minutesRate=k[A]=0.69320×0.01=3.47×10−4mol L−1min−1