The hydrogenation of pyridine (C₅H₅N) produces piperidine (C₅H₁₀NH). The actual yield of the reaction below is 83.0%. Calculate the mass of pyridine in grams produced from 42.5 g of pyridine (MW piperidine = 85.148 amu; MW pyridine = 79.1 amu).

• A. 17.4 g
• B. 38.0 g
• C. 21.9 g
• D. 40.4 g

Answer: (B)