
Interpretation: To calculate the mass of manganese-56 at the end.
Concept Introduction: Half-life is the time needed for half the nuclei in a radioactive sample to decay into products. It is denoted by

Answer to Problem 9SP
The remaining mass of manganese-56 is
Explanation of Solution
The half-life is 2.6 h.
The time is 10.4 h.
Thus, the number of half-lives can be calculated as follows:
Hence, the total number of half-lives is 4.
The equation that is used to calculate the mass of radioisotope that remains in a sample can be given as follows:
Here,
Substituting
Thus, the remaining mass of manganese-56 is
Chapter 25 Solutions
Chemistry 2012 Student Edition (hard Cover) Grade 11
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