Question

The time for half-life period of a certain reaction a→ products is 1 hour. When the initial concentration of the reactant ‘a', is 2.0moll−1, how much time does it take for its concentration to come from 0.50 to 0.25moll−1 if it is a zero order reaction?

Answer 1

Answer: For a zero order reaction ,k= rate constant

When t=ty2, then x=|A|o2

Given that [A0]=2M

ty2=1hr,K=1

∴K=|A|02×ty2=22×1

=1mol.L−1.hr−1

Now, change in conc (x)=0.50−0.25

=0.25M

∴t=xk=0.251=0.25hr

Hence c is the correct answer.

Explanation: