Practice question
Question
What volume of O₂ at STP is required to burn 9 g of C₃H₈ completely to CO₂ and H₂O? (Molar mass: C₃H₈ = 44 g/mol)
Explanation
Reaction: C₃H₈ + 5O₂ → 3CO₂ + 4H₂O. Moles of C₃H₈ ≈ 0.2045 mol. 1 mol needs 5 mol O₂; 0.2045 mol needs 1.0225 mol. Volume = 1.0225 × 22.4 ≈ 22.9 L.
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