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Practice question

MCQ

Question

What is the mole fraction of C₂H₅OH in a solution containing 23 g of C₂H₅OH and 18 g of H₂O? (Molar masses: C₂H₅OH = 46 g/mol, H₂O = 18 g/mol)

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Explanation

Moles of C₂H₅OH = 23/46 = 0.5 mol; moles of H₂O = 1 mol. Total moles = 1.5. Mole fraction = 0.5/1.5 ≈ 0.333.

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