An Analyst Needs to Prepare a Standard of Fentanyl for a Toxicological

question 14

Multiple Choice

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. The analyst is preparing 100.0 mL of the standard at a concentration of 250 ppm (mg/L) . How much powder will they have to weigh out to make this standard?

• A) 25.0
• B) 12.5
• C) 50.0
• D) 39.3
• E) none of the above

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