How much of a 0.230 g radioactive sample with a half-life of 8 hours would remain after a period of 2.50 days?

Name: How much of a 0.230 g radioactive sample with a half-life of 8 hours would remain after a period of 2.50 days?
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Question

Quizplus · Accepted Answer

First, calculate the number of half-lives that pass in 2.50 days: 2.50 days * (24 hours/day) / 8 hours/half-life = 7.5 half-lives. Then, use the formula for radioactive decay: remaining mass = initial mass * (1/2)^(number of half-lives) = 0.230 g * (1/2)^7.5 ≈ 1.27 x 10^-3 g.

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