A hormone has a half-life of 20 minutes. After an hour, ________ percent of the original number of molecules remains.
A)0
B)12.5
C)25
D)50

Name: A hormone has a half-life of 20 minutes. After an hour, ________ percent of the original number of molecules remains. A)0 B)12.5 C)25 D)50
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Question

Quizplus · Accepted Answer

After an hour, which is 60 minutes, three half-lives of the hormone (20 minutes per half-life) would have passed. After the first half-life, 50% remains; after the second, 25%; and after the third, 12.5%.

A Hormone Has a Half-Life of 20 Minutes