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May 24, 2015

Homework Help: Chemistry

Posted by Anonymous on Thursday, January 31, 2013 at 1:59pm.

Calculate the half-life (in s) of a first-order reaction if the concentration of the reactant is 0.0655 M 18.4 s after the reaction starts and is 0.0173 M 41.2 s after the reaction starts.

I got 25.6

Suppose the half-life is 23.7 s for a first order reaction and the reactant concentration is 0.0709 M 60.1 s after the reaction starts. How many seconds after the start of the reaction does it take for the reactant concentration to decrease to 0.0154 M?

I got 79.05.

Any help is appreciated!

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