Sodium-25 was to be used in an experiment but it took 3.0 minutes to get the sodium from the reactor to the laboratory if 5.0 mg of sodium-25 was removed from the reactor how many mg of sodium-25 were placed in the reaction vessel 3.0 minutes later if the half-life of sodium-25 is 60 seconds

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Jermaine Gaines

11 November, 21:51

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Justine Rocha · Answer 1

3 half lives later ... 5/2 = 2.5mg, then 2.5/2 = 1.25 mg, then 1.25/2 =.625 mg left