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A first-order reaction has a half-life of 2.2 h. If the initial concentration is 132 nM, how long will it take for the concentration

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A first-order reaction has a half-life of 2.2 h. If the initial concentration is 132 nM, how long will it take for the concentration to fall to 84 nM? Give your answer in h to two decimal places. You do not need to write the units in your answer.

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