Posted by **kiril** on Friday, December 14, 2012 at 6:35am.

The half-life of a first order reaction is determined to be 92.0 years. How long will it take for the concentration of the reactant to reach 2% of its initial value?

- chemistry -
**Paul**, Friday, December 14, 2012 at 7:07am
You meant to say the question is: The half-life of a first order reaction is determined to be 85.5 years. How long will it take for the concentration of the reactant to reach 2% of its initial value?

- chemistry -
**abhi**, Friday, December 14, 2012 at 8:44am
Make use of the formula t=2.303/k*log[Ri/Rf]....where k=0.639/halflyf Rf=2/100Ri..

- chemistry -
**Paul**, Friday, December 14, 2012 at 9:15am
Got it 519.23512

92.0 years X (multiply) with 5.64386

- chemistry -
**MIT**, Friday, December 14, 2012 at 11:11am
You are not allowed to post answers to exam problems. Collaboration of any form is strictly

forbidden in the midterms and the ﬁnal exams.

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