Suppose a laboratory has a 31 g sample of polonium-210. The half-life of polonium-210 is about 138 days. a. How many half-lives of polonium-210 occur in 966 days? b. How much polonium is in the sample 966 days later?
7; 4.43 g
7; 2,139 g
7; 0.24 g
8; 0.12 g
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