What is the mole fraction of water in a mixture of 36 g water and 46 g ethanol?
Answer and explanation
Correct answer: about 0.667
Mole fraction is calculated from moles, not directly from masses. Using the given molar masses, water gives 36/18 = 2 mol and ethanol gives 46/46 = 1 mol. The total is 3 mol, so x_water = 2/3 = 0.6667, approximately 0.667. Thus option A is correct. Option B is the ethanol mole fraction, while the other options do not follow from the stated amounts.
Frequently asked questions
What is the correct answer to this question?
about 0.667
Why is this the correct answer?
Mole fraction is calculated from moles, not directly from masses. Using the given molar masses, water gives 36/18 = 2 mol and ethanol gives 46/46 = 1 mol. The total is 3 mol, so x_water = 2/3 = 0.6667, approximately 0.667. Thus option A is correct. Option B is the ethanol mole fraction, while the other options do not follow from the stated amounts.
Which subject and chapter does this question cover?
This is a Class 11 Chemistry question. Chapter: Chapter 01: Solutions.
