Practice question
Question
What volume of O₂ at STP is required to burn 5.6 g of C₂H₄ completely to CO₂ and H₂O? (Molar mass: C₂H₄ = 28 g/mol)
Explanation
Reaction: C₂H₄ + 3O₂ → 2CO₂ + 2H₂O. Moles of C₂H₄ = 5.6/28 = 0.2 mol. 1 mol C₂H₄ needs 3 mol O₂; 0.2 mol needs 0.6 mol. Volume = 0.6 × 22.4 = 13.44 L.
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