(A) follows first order reaction, (A) → product.
The concentration of A changes from 0.1 to 0.025 M in 40 min.
Find the rate of reaction of A when the concentration of A is 0.01 M.
3.47×10−4 M min−1
For first order reaction,
k=2.303t logaa−x
=2.30340log0.10.02
=3.46×10−2
Rate =[k]A=3.46×10−2×0.01
=3.46×10−4