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Practice question

MCQ

Question

What is the mole fraction of CH₃OH in a solution containing 8 g of CH₃OH and 54 g of H₂O? (Molar masses: CH₃OH = 32 g/mol, H₂O = 18 g/mol)

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Explanation

Moles of CH₃OH = 8/32 = 0.25 mol; moles of H₂O = 54/18 = 3 mol. Total moles = 0.25 + 3 = 3.25. Mole fraction = 0.25/3.25 ≈ 0.0769.

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