Interpretation:
The amount of 10.0 g of sample of americium-241 remains after four half lives needs to be calculated.
Concept introduction:
The time needed for one half of nuclei of radioisotope to decay into its products is the half life. The formula to calculate remaining amount of radioactive element is,
Where

Answer to Problem 16SSC
The amount of 10.0 g of sample of americium-241 remains after four half lives is 0.625 g.
Explanation of Solution
Amount of sample (
The measurement of radioactive decay is done in half lives.
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