Question

A first order reaction, A → B takes 100 minutes for it's 90% completion. What is the rate constant of reaction?

Options

• 0.0460 min^-1

• 0.0230 min^-1

• 0.2303 min^-1

• 0.4606 min^-1

Answer 1

0.0230 min^-1 

Explanation:

For first order reaction,

k = `2.303/"t" log_10  (["A"]_0)/(["A"]_"t")`

`= 2.303/100 log_10  100/10`

k = 0.02303 × 1

k = 0.02303 min^-1