If the half-life of an element is 12 years. How much of a 5.00 g sample remains after 36 years?

Name: If the half-life of an element is 12 years. How much of a 5.00 g sample remains after 36 years?
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Question

Quizplus · Accepted Answer

After 1 half-life, half of the original sample remains, which is 2.50 g. After 2 half-lives, or 24 years, half of that remaining sample will remain, which is 1.25 g. After 3 half-lives, or 36 years, half of that remaining sample will remain, which is 0.625 g. Therefore, the answer is (C) 0.625.

If the Half-Life of an Element Is 12 Years