Question

The rate constant for a particular zero-order reaction is 0.075 M s-1. If the initial concentration of reactant is 0.537 M it takes ________ s for the concentration to decrease to 0.100 M.

Answer 1

Answer : It takes time for the concentration to decrease to 0.100 M is, 22.4 s

Explanation :

Formula used to calculate the rate constant for zero order reaction.

The expression used is:

$\ln [A]=-kt+\ln [A_o]$

where,

$[A_o]$ = initial concentration = 0.537 M

$[A]$ = final concentration = 0.100 M

t = time = ?

k = rate constant = 0.075 M/s

Now put all the given values in the above expression, we get:

$\ln (0.100)=-0.075\times t+\ln (0.537)$

$t=22.4s$

Therefore, it takes time for the concentration to decrease to 0.100 M is, 22.4 s