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OpenStudy (anonymous):
It took 20.8 y for 44.0 g of a radioactive isotope to decay to 11.0 g. What is the half-life of this isotope? Question 10 options: 8.21 y 10.4 y 12.8 y 15.3 y 18.5 y
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OpenStudy (anonymous):
@hartnn
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