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OpenStudy (anonymous):
please help! The radioactive element americium-241 has a half-life of 432 years. Suppose we start with a 25-g mass of americium-241. How much will be left after 283 years? Compute the answer to three significant digits.
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OpenStudy (anonymous):
if i got i right it will be left 16,812 g if halflife is 432 years so in that time you would be left with 12,5 g and 283/432 = 0,655 so 12,5*0,655 = 8,1875 so 25-8,1875 = 16,8125 g
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