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Topic: Kinetics (half-life) problem.  (Read 2538 times)

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Offline tdod

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Kinetics (half-life) problem.
« on: May 13, 2012, 01:30:18 PM »
I'm not sure how to do this problem, if someone can explain would be great:

"Consider the second-order reaction of aA --> products (which has a first half-life of 22 s). If the concentration of A after 13.4 seconds in .46 M, determine the initial concentration of A.
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Offline ramboacid

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Re: Kinetics (half-life) problem.
« Reply #1 on: May 13, 2012, 03:40:03 PM »
Are you familiar with integrated rate laws?
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Offline tdod

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Re: Kinetics (half-life) problem.
« Reply #2 on: May 13, 2012, 04:43:34 PM »
Quote from: ramboacid on May 13, 2012, 03:40:03 PM
Are you familiar with integrated rate laws?
Ya, i know that for second order:
1/[A] = -kt + ln[A]o
t1/2 = 1/(k[A]o)

However, I would need k to calculate [A]o from the first equation, and i would need [A]o to calculate k from the second equation.
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