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The half life of Am-241 is 432 y. If 2.00 g of Am-241 is present in a sample, what mass of Am-241 is present after 1000.0 y?

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k = 0.693/t_1/2
Solve for k and substitute in the equation below.

ln(No/N) = kt
No = 2.00
N = unknown
k from above
t = 1000 years.

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