For a first order reaction , `A to` Products, the concentrations of A changes from 0.1 M to 0.025 M in 40 minutes. The rate of reaction when the concentration of A is 0.01 M is:

Options

A. `1.73xx10^(-5)` M/min
B. `3.47xx10^(-4)` M/min
C. `3.47xx10^(-5)` M/min
D. `1.73xx10^(-4)` M/min

Answer

B

Explanation

`K=(1)/(40)ln.(0.1)/(0.025)=(1)/(40)ln4`
`R=K[A]^(1)=(1)/(40)ln4(.01)=(2ln2)/(40)(.01)=3.47xx10^(-4)`