A 9.52 × 10-5 mol sample of rubidium-86 emits 8.87 × 1016 β particles in one hour. What is the half-life of rubidium-86?
A) 2.23 × 10 -3 h
B) 1.55 × 10 -3 h
C) 448 h
D) 645 h
E) None of these choices are correct.
Correct Answer:
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