Question

Suppose a laboratory has a 61 g sample of polonium-210. The half-life of polonium-210 is about 138 days.

Answer 1

To answer for the first question, divide 828 days with the half-life, 138 days. There are 6 half-lives of polonium-210 in 828 days. 

For the second question, raise 0.5 to number of half-lives which was calculated in a, 6. Then, multiply with the initial amount, 61 g. Thus, after 828 days there are only about 0.9531 g of polonium-210 left. 

Answer 2

Answer: THE ANSWER IS B

Step-by-step explanation:

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