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Practice question

MCQ

Question

What is the mole fraction of NaCl in a solution made by dissolving 5.85 g of NaCl in 90 g of water? (Molar masses: NaCl = 58.5 g/mol, H₂O = 18 g/mol)

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Explanation

Moles of NaCl = 0.1 mol. Moles of H₂O = 5 mol. Total moles = 5.1; mole fraction = 0.1/5.1 ≈ 0.0196.

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