I kind of have an idea on how to do it, but then i\'m notreally sure how to do i

Question

I kind of have an idea on how to do it, but then i'm notreally sure how to do it or how each step goes...i Know that youwould use the first order but then after that i'm not sosure...Please help ASAP!!
The half life of a first order reaction is 13 min. If theinitial concentration of reactant is 0.085 M, ittakes___________min for it to decrease to 0.055M. I kind of have an idea on how to do it, but then i'm notreally sure how to do it or how each step goes...i Know that youwould use the first order but then after that i'm not sosure...Please help ASAP!!
The half life of a first order reaction is 13 min. If theinitial concentration of reactant is 0.085 M, ittakes___________min for it to decrease to 0.055M.

Explanation / Answer

Integrated rate law for first order t1/2 = ln2/k 13 min= ln2 / k k = .0533 min-1 ln[A] = -kt + ln[A0] ln(.055) = (-.0533)(t) + ln(.085) t = 8.16 min

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