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September 20, 2014

Homework Help: Chemistry

Posted by Marcus on Monday, February 18, 2013 at 7:37am.

In a given 1st order reaction A ---> products, the initial concentration of A is 0.40 M. What will be the concentration of A after 15 seconds if the half-life of the reaction is 3 seconds?

I found the concentration to be 1.25 x 10-2 M

But then how do I find the rate constant of the reaction for this problem?

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