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OpenStudy (anonymous):
The radioactive element americium-241 has a half-life of 432 years. Suppose we start with a 20-g mass of americium-241. How much will be left after 349 years? Compute the answer to three significant digits.
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OpenStudy (anonymous):
X= 20 x .5^(349/432) If you plug it into a calculator you should get 11.4 g after 349 years
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