What is the half-life of a radioactive substance if 2.9 g decays to 1.80 g in 64 hours? Round to the nearest tenth of an hour.
A) 93.0 hours
B) 69.8 hours
C) 46.5 hours
D) 23.3 hours
E) 13.8 hours

Question

Quizplus · Accepted Answer

The half-life of a radioactive substance is the time it takes for half of the substance to decay. In this case, 2.9 g of the substance decays to 1.80 g in 64 hours. So, the half-life of the substance is 64 hours.

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