Question

The reaction X → product

Follow first order of kinetics. In 40 minutes the concentration of 'X' changes from 0.1 m to 0.025. M. The rate of reaction when concentration of X is 0.01 m is.

Options

• 1.73 × 10^–5 min^–1

• 3.47 × 10^–5 mol^–1

• 3.47 × 10^–4 min^–1

• 1.73 × 10^–5 min^–1

Answer 1

3.47 × 10^–4 min^–1 

Explanation:

K = `2.303/t  log  a/(a - x)`

= `2.303/((40  min)) log  ((0.1  "m"))/((0.025  "m"))`

= `2.303/((40  min)) log  ((0.1  "m"))/((0.025  "m"))`

= 0.03467 min

rate = K (X)

= 0.03467 min^–1 × 0.01 m

= 3.47 × 10^–4 min^–1.