Homework Help: Chemistry

Posted by Chemistry on Saturday, December 15, 2012 at 4:18pm.

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 - Damon, Saturday, December 15, 2012 at 4:51pm
(1/2)^n = .02
n ln .5 = ln .02
n = -3.91/-.693
n = 5.644 half lives
times 92 = 519 years
Chemistry - Anonymous, Saturday, December 15, 2012 at 4:59pm
92.0 years X (multiply) with 5.64386

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