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Solution: A radioactive nucleus, X1, decays into a second radioactive ...

Question

A radioactive nucleus, X1, decays into a second radioactive nucleus, X 2. The halflife of X1 is 30.4 min, and the halflife of X 2 is 2.5 min. If a radioactive sample begins with 5 g of X 1 and 10 g of X2, how many grams of X 2 will there be after 5 minutes?