SOLUTION: 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 321 years? Compute the answer t

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Question 777365: 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 321 years? Compute the answer to three significant digits.
Answer by Cromlix(4381) About Me  (Show Source):
You can put this solution on YOUR website!
321/432 * 100 = 74.3%
74.3% of 20g of americium - 241
= 14.86g
20g - 14.86g = 5.14g left active.
Hope this helps.
;-)