Chemical Kinetics

For a first order reaction, (A) → products, the concentration 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

  1. 3.47 x 10-5 M/min
  2. 1.73 x 10-4 M/min
  3. 1.73 x 10-5 M/min
  4. 3.47 x 10-4 M/min

Answer

k = 2.303/40*log(0.1/0.025)

k = 0.693/20

For a First order reaction,

rate = k[A]

rate = 0.693*10-2/20

The correct option is D.