Interpretation:
The amount of sample B and C is to be calculated when sample A has 16.2 g remaining.
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
The n can be replaced with the equivalent quantity

Answer to Problem 11PP
The amount of B is 32.3 g and amount of C is 29.2 g.
Explanation of Solution
Sample A will have 16.2 grams reaming after two half-lives, or 10.54 years. For sample B, amount remaining,
For sample C, amount remaining,
The measurement of radioactive decay is done in half lives.
Chapter 24 Solutions
Chemistry: Matter and Change
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