MDCAT Chemistry MCQ #452

If 0.1 moles of ethanal react with hydrogen cyanide to form a cyanohydrin, what mass of HCN in grams is consumed?

MDCAT Chemistry MCQ #452

  1. Question 1

    Q1. If 0.1 moles of ethanal react with hydrogen cyanide to form a cyanohydrin, what mass of HCN in grams is consumed?

    • A) 1.35g
    • B) 2.70g
    • C) 5.40g
    • D) 27.0g

    Answer: 2.70g

    Explanation: 0.1 moles of ethanal react with 0.1 moles of HCN (27 g/mol), totaling 2.7g. 1.35g is only a half-molar mass.