Question

A first-order reaction has a rate constant of 0.33 min-1. It takes __________ min for the reactant concentration to decrease from 0.13 m to 0.088 m.

Answer 1

Answer:

1.18 min

Explanation:

This is the given sum from the chapter Chemical kinetics.

Okay , now to solve the sum we have to perform few steps,

For first order reaction :

ln[A]t =  -kt + ln[A]0

t 1/2 = 0.693/k

Now given k = 0.33, ln[A]0 = 0.13, ln[A]t = 0.088

Therefore,

ln[A]0 - ln[A] = kt

=> 0.33 - 0.088 = 0.33* t

=> t = 1.18 min (Answer).