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21 October, 10:53

How many days are required for 200. grams of radon-222 to decay to 50.0 grams?

(1) 1.91 days (3) 7.64 days (2) 3.82 days (4) 11.5 days

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  1. 21 October, 11:13
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    The answer is (3) 7.64 days. The remaining mass of radon-222 is one fourth of the original mass, so two half lives have elapsed (because one half time one half equals one fourth). Each half life of radon-222 is about 3.82 days, so the total time elapsed is 3.82 * 2 = 7.64 days
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