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The light-emitting decay of excited mercury atoms is first-order, with a rate constant of 1.65E6 1/s....

The light-emitting decay of excited mercury atoms is first-order, with a rate constant of 1.65E6 1/s. A sample contains 7.6E-6 M of excited mercury atoms.

Find the time at which the concentration will be 4.5E-7 M.

Find the concentration after 2.5E-6 s.

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