Practice question
Question
What is the mole fraction of water in a solution containing 36 g of water and 46 g of ethanol (C₂H₅OH)? (Molar masses: H₂O = 18 g/mol, ethanol = 46 g/mol)
Explanation
Moles of H₂O = 36/18 = 2 mol; moles of ethanol = 46/46 = 1 mol. Total moles = 3. Mole fraction of water = 2/3 ≈ 0.667.
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