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OpenStudy (anonymous):
If the half-life of 232Th is 1.4 * 10^10 years. If there are 25.0 g left of the sample after 2.8 * 10^10, how many grams were in the original sample? I know that the answer is 100g, but can some explain how to do this algebraically?
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OpenStudy (aaronq):
How many half-lives have passed in "2.8 * 10^10 years"?
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