Practice question
Question
What volume of O₂ at STP is required to burn 5 g of C₂H₅OH completely to CO₂ and H₂O? (Molar mass: C₂H₅OH = 46 g/mol)
Explanation
Reaction: C₂H₅OH + 3O₂ → 2CO₂ + 3H₂O. Moles of C₂H₅OH = 5/46 ≈ 0.1087 mol. 1 mol needs 3 mol O₂; 0.1087 mol needs 0.3261 mol. Volume = 0.3261 × 22.4 ≈ 7.3 L.
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