13. The rate constant of a first order reaction is 6.8 x 10 s. If the initial concentration of the reactant is 0.04 M. what is its molarity after 20 minutes? How long will it take for 25% of thereactant to react?

13. The rate constant of a first order reaction is 6.8 x 10 s. If the

1.	13. The rate constant of a first order reaction is 6.8 x 10 s. If the initial concentration of the reactant is 0.04 M. what is its molarity after 20 minutes? How long will it take for 25% of thereactant to react?
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