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Understanding radioactive decay, half-life and nuclear chemistry.

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If you start with 64 g of a material with a half-life of 10 years, how much will be left at the end of 40 years?

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Solution Preview

Conceptually, you can work through this problem step by step:

At the end of -----You will have
10 years-------------32 g left
20 years------------- 16 g left
30 ...