If the half-life of phosphorus-32 is 14.3 days,how much of a 200. mg sample of phosphorus-32 remains after 71.5 days?

Question

Quizplus · Accepted Answer

The half-life of phosphorus-32 is 14.3 days. After 71.5 days, which is 5 half-lives (71.5 / 14.3 = 5), the sample will have gone through 5 half-lives. Each half-life reduces the amount by half: 200 mg → 100 mg → 50 mg → 25 mg → 12.5 mg → 6.25 mg. Thus, 6.25 mg remains.

If the Half-Life of Phosphorus-32 Is 14