21. Nuclear Chemistry
Radioactive Half-Life
Multiple Choice
Multiple ChoiceThe half-life of arsenic-74 is about 18 days. If a sample initially contains 5.13 x 104 mg arsenic-74, what mass (in mg) would be left after 80 days?
A
2.36 x 103 mg
B
7.02 x 102 mg
C
1.43 x 103 mg
D
1.14 x 108 mg
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