Nitrogen-13 has a half-life of 10 minutes. What amount of a 16 mg sample would remain after 30 minutes?

Question

Quizplus · Accepted Answer

After 10 minutes, half of the sample would remain, which would be 8 mg. 
After another 10 minutes (20 minutes total), half of that amount would remain, which would be 4 mg. 
After another 10 minutes (30 minutes total), half of that amount would remain, which would be 2 mg.

Therefore, the answer is C) 2 mg.

Nitrogen-13 Has a Half-Life of 10 Minutes