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28 May, 14:00

The radioisotope radon-222 has half-life of 3.8 days. how much of a 73.9-g sample of radon-222 would be left after approximately 23 days?

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  1. 28 May, 17:05
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    This can be solved by the equation:

    A = Aoe^ (-ln2/t) T

    where Ao is the initial amount of the substance (73.9-g sample of radon-222), t is the half-life time (3.8 days) and T is the time elapsed. Plugging in the values in the equation, the substance left is 1.11g.
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