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.
Found an issue with this question?
Related Questions
More from Solutions
A 5% solution (by mass) of cane sugar in water has freezing point of 271 K and freezing point of pure water is 273.15 K. The freezing point of a 5% so...
Elevation in the boiling point for 1 molal solution of glucose is 2 K. The depression in the freezing point for 2 molal solution of glucose in the sam...
What amount of CaCl₂ (i = 2.47) is dissolved in 2 litres of water so that its osmotic pressure is 0.5 atm at 27°C?
More from
Calculate the total vapour pressure of an ideal solution at a certain temperature if the mole fraction of component 1 is 0.4, its vapour pressure in p...
A solution is made by mixing 200 g of ethanol (C2H5OH) with 300 g of water. If the vapor pressure of pure water at the same temperature is 24 mmHg and...