# Initial conc of reactant in a first order reaction is 10M . The half life period of reaction is 10 sec . The rate of reaction after 20 sec

Dear Student,

To solve this, first we need to find the concentration of the reactant at time=20s.
Let the reactant be A.
So, [Ao] = 10 M, t1/2 = 10 s, t = 20 s
Now,

Hope it helps.

Regards

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