An analyst needs to prepare a standard of fentanyl for a toxicological analysis. The standard is supplied as a powder of fentanyl citrate. The formula weight of the citrate salt is 528.6 g/mol and the formula weight of fentanyl alone is 336.5 g/mole. What percentage of the salt is fentanyl?
A) 52
B) 76
C) 64
D) 13
E) none of the above
Correct Answer:
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