Fluorine-18 is a radioactive isotope used as a tracer atom in drugs in the human body. How much fluorine-18 was originally used in a drug sample if there is only 0.124 mg left in a sample after 2.5 h? (The half-life of fluorine-18 is 110 minutes.)
A) 0.734 mg
B) 1.00 mg
C) 0.319 mg
D) 0.578 mg
E) 0.212 mg
Correct Answer:
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