Half-life is the time required for 50% of the compound to decay. If a 128 mg sample undergoes 6 successive half-lives, how much sample will be left?

Name: Half-life is the time required for 50% of the compound to decay. If a 128 mg sample undergoes 6 successive half-lives, how much sample will be left?
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Question

Quizplus · Accepted Answer

After each half-life, the amount of the compound is reduced by half. After 6 half-lives, the amount is reduced by $ \frac{1}{2^6} = \frac{1}{64} $. Therefore, $ \frac{128}{64} = 2 $ mg.

Half-Life Is the Time Required for 50% of the Compound