MDCAT Chemistry MCQ #4525

A hydrocarbon (C₃H₆) reacts with H₂ to form C₃H₈. If 2.24 dm³ of H₂ is consumed at STP, what mass of C₃H₆ reacted?

MDCAT Chemistry MCQ #4525

  1. Question 1

    Q1. A hydrocarbon (C₃H₆) reacts with H₂ to form C₃H₈. If 2.24 dm³ of H₂ is consumed at STP, what mass of C₃H₆ reacted?

    • A) 1.4 g
    • B) 2.8 g
    • C) 4.2 g
    • D) 5.6 g

    Answer: 2.8 g

    Explanation: 1:1 mole ratio between C₃H₆ and H₂. 0.1 mol H₂ = 0.1 mol C₃H₆ = 2.8 g. Distractor A halves molar mass.