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OpenStudy (anonymous):
Please Help! The half-life of a radioactive isotope is the time it takes for a quantity of the isotope to be reduced to half its initial mass. Starting with 140 grams of a radioactive isotope, how much will be left after 5 half-lives?
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OpenStudy (welshfella):
after one half life we will have 70 grams - and so on for 4 more half lives
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