MDCAT Chemistry MCQ #112

How much energy is required to boil 50 g of ethanol? (ΔHvap=40.5 kJ/mol, molar mass=46 g/mol)

MDCAT Chemistry MCQ #112

  1. Question 1

    Q1. How much energy is required to boil 50 g of ethanol? (ΔHvap=40.5 kJ/mol, molar mass=46 g/mol)

    • A) 44 kJ
    • B) 89 kJ
    • C) 102 kJ
    • D) 203 kJ

    Answer: 44 kJ

    Explanation: Moles = 50 / 46 ≈ 1.09 mol. Energy = 1.09 × 40.5 ≈ 44.1 kJ. Option C adds 46 g/mol to calculation.