The half-life of iodine-123 is 13.3 hours. How much of a 50.0 mg sample will remain after 39.9 hours?

Name: The half-life of iodine-123 is 13.3 hours. How much of a 50.0 mg sample will remain after 39.9 hours?
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After 39.9 hours, which is three half-lives of iodine-123 (13.3 hours x 3 = 39.9 hours), the amount of the substance will have halved three times. Starting with 50.0 mg, after one half-life, it becomes 25.0 mg; after two, 12.5 mg; and after three, 6.25 mg.

The Half-Life of Iodine-123 Is 13