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How many moles are in a 500g sample of mercury fluoride?
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What is the half life of an isotope if 125g of a 500g sample o the isotope remains after 30 years?
If 125g of a 500g sample remains after 30 years, then 0.25 of the original sample remains after 30 years. By inspection alone, you can see that the half-life is 15 years, i.e. after 15, 30, 45, and 60 years, you would expect 0.5, 0.25, 0.125, and 0. 0625 of the original to remain. Formally, the equation is ... AT = A0 2(-T/H) ... where A0 is starting activity, AT is activity after some time T, and H is half-life in units of T.