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Moles of water = (18/18) = 1 mol . Moles of ethanol = (46/46) = 1 mol . Total moles = 1 + 1 = 2. Mole fraction of water = (1/2) = 0.5 .
Ref: NCERT Class 12 Chemistry > Chapter 1: Solutions > Topic: Abnormal Molar Masses and van't Hoff Factor
Moles of H₂O = 2 mol; moles of C₂H₅OH = 1 mol. Total moles = 3. Mole fraction = 2/3 ≈ 0.667.
Ref: NCERT Class 11 Chemistry > Chapter 1: Some Basic Concepts of Chemistry > Topic: Concentration Terms - Molarity Molality and Mole Fraction
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