Approximately what mass of a 1.00 mg sample of 131I remains after 40.2 days? The half-life of 131I is 8.04 d.

Name: Approximately what mass of a 1.00 mg sample of 131I remains after 40.2 days? The half-life of 131I is 8.04 d.
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Quizplus · Accepted Answer

The number of half-lives is 40.2 days / 8.04 days = 5. After 5 half-lives, the remaining mass is (1/2)^5 of the original mass, which is 1.00 mg * (1/2)^5 = 0.0313 mg.

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