The half-life of iodine-131 is 8.1 days. How much of a 75.0 mg sample will remain after 24.3 days?

Name: The half-life of iodine-131 is 8.1 days. How much of a 75.0 mg sample will remain after 24.3 days?
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Quizplus · Accepted Answer

The half-life of iodine-131 is 8.1 days, so in 24.3 days, which is three half-lives (24.3 / 8.1 = 3), the sample will be reduced to (1/2)^3 of its original amount. Starting with 75.0 mg, after three half-lives, 75.0 mg * (1/8) = 9.38 mg will remain.

The Half-Life of Iodine-131 Is 8