Chemistry order problem

Chemistry
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It is very desirable that pesticides eventually decompose in the environment to give harmless products. Let us assume the half life for the first order decomposition of a certain pesticide is 10.2 years. If the present concentration of a pesticide in a lake is 3.00x10^-3 M, what was the concentration 4.00 years ago?

Sep 27th, 2015

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Sep 27th, 2015

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Sep 27th, 2015

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