1. If the amount of the parent isotope in the original sample of a rock had been 48 grams, about how much would have been left after three half-lives?  2. A parent isotope has a half-life of 500,000 years. If a rock contained 10 mg of the parent isotope when it formed, how much parent isotope would be left after 1.5 million years?

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Chapter20: Nuclear Chemistry
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1. If the amount of the parent isotope in the original sample of a rock had been 48 grams, about how much would have been left after three half-lives? 

2. A parent isotope has a half-life of 500,000 years. If a rock contained 10 mg of the parent isotope when it formed, how much parent isotope would be left after 1.5 million years? 

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