Practice question
Question
What is the mole fraction of CH₃OH in a solution containing 16 g of CH₃OH and 72 g of H₂O? (Molar masses: CH₃OH = 32 g/mol, H₂O = 18 g/mol)
Explanation
Moles of CH₃OH = 16/32 = 0.5 mol; moles of H₂O = 72/18 = 4 mol. Total moles = 4.5. Mole fraction = 0.5/4.5 ≈ 0.111.
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