The half-life of technetium-99 is 6.0 hours. How much of a 25.0 mg sample will remain after 24 hours?

Name: The half-life of technetium-99 is 6.0 hours. How much of a 25.0 mg sample will remain after 24 hours?
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Quizplus · Accepted Answer

After 24 hours, which is 4 half-lives (24 hours / 6 hours per half-life), the amount of technetium-99 remaining would be $25.0 \, \text{mg} \times (\frac{1}{2})^4 = 25.0 \, \text{mg} \times \frac{1}{16} = 1.56 \, \text{mg}$.

The Half-Life of Technetium-99 Is 6