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A 5.2 molal aqueous solution of methanol (CH3OH) is given. Determine the mole fraction of methanol in this solution.

1. 0.086
2. 0.050
3. 0.100
4. 0.190

Correct answer: 0.086

Solution

With 5.2 mol methanol and 55.56 mol water (1 kg), the mole fraction is 5.2/60.76 approximately 0.086.

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