MDCAT Chemistry MCQ #4526

Calculate the molar mass of an alkene that produces 11.2 dm³ CO₂ (at STP) when 4.2 g is burned completely.

MDCAT Chemistry MCQ #4526

  1. Question 1

    Q1. Calculate the molar mass of an alkene that produces 11.2 dm³ CO₂ (at STP) when 4.2 g is burned completely.

    • A) 28 g/mol
    • B) 42 g/mol
    • C) 56 g/mol
    • D) 70 g/mol

    Answer: 56 g/mol

    Explanation: Moles of CO₂ = 0.5. Carbon atoms = 0.5. Molar mass = 4.2/0.35 = 12 g/mol × n. Distractor B ignores H₂O product.