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OpenStudy (royalkiwi):
A 60.0-g sample of fermium-253 was placed in a sealed vessel 9.0 days ago. Only 7.5 g of this isotope is now left. What is the half-life of fermium-253? 3.0 days 4.5 days 17.5 days 20.0 days
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OpenStudy (royalkiwi):
Nvm it was A
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