Sodium-24 has a half-life of 15 hours.How much of a 20 mg sample would remain after two half-lives?

Name: Sodium-24 has a half-life of 15 hours.How much of a 20 mg sample would remain after two half-lives?
Brand: Quizplus
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Question

Quizplus · Accepted Answer

After one half-life (15 hours), half of the initial amount of sodium-24 would remain, which is 10 mg. After another half-life (a total of 30 hours), half of the remaining 10 mg would remain, which is 5 mg. Therefore, the answer is C.

Sodium-24 Has a Half-Life of 15 Hours