Practice question
Question
What volume of CO₂ at STP is produced when 7 g of C₂H₂ is burned completely? (Molar mass: C₂H₂ = 26 g/mol)
Explanation
Reaction: 2C₂H₂ + 5O₂ → 4CO₂ + 2H₂O. Moles of C₂H₂ = 7/26 ≈ 0.2692 mol. 2 mol C₂H₂ produce 4 mol CO₂; 0.2692 mol produce 0.5384 mol. Volume = 0.5384 × 22.4 ≈ 12.06 L.
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