How long does it take for 10.0 g of a radioactive isotope to decay to 1.25 g if its half-life is 17.0 d?

Name: How long does it take for 10.0 g of a radioactive isotope to decay to 1.25 g if its half-life is 17.0 d?
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Question

Quizplus · Accepted Answer

To go from 10.0 g to 1.25 g, the isotope undergoes three half-lives (10 g to 5 g, 5 g to 2.5 g, and 2.5 g to 1.25 g). Since each half-life is 17.0 days, it takes 3 half-lives or 3 x 17.0 days = 51.0 days.

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