STANDARD Chemistry Mole Fraction MCQ Question
What will be the mole fraction of ethanol in a sample of spirit containing 85% ethanol by mass?
0.69
0.82
0.85
0.60
Correct Answer
Detailed Explanation
The mole fraction of ethanol is calculated by dividing the moles of ethanol by the total moles of the solution. Given 85 g of ethanol and 15 g of water, the moles of ethanol (C₂H₅OH) is 1.85 mol and the moles of water (H₂O) is 0.833 mol. The mole fraction is 1.85 / (1.85 + 0.833) = 0.69.
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