46 g ethanol is mixed with 90 g water. Molar masses are 46 and 18 g mol−1, respectively. What is the mole fraction of ethanol?
Answer and explanation
Correct answer: 1/6
The mole fraction of a component equals its moles divided by the total moles of all components. Ethanol provides 46 ÷ 46 = 1 mol, while water provides 90 ÷ 18 = 5 mol. Total moles = 6, so the ethanol mole fraction is 1 ÷ 6 = 1/6. Therefore option A is correct. Option C is the water mole fraction, and options B and D do not use the correct total.
Frequently asked questions
What is the correct answer to this question?
1/6
Why is this the correct answer?
The mole fraction of a component equals its moles divided by the total moles of all components. Ethanol provides 46 ÷ 46 = 1 mol, while water provides 90 ÷ 18 = 5 mol. Total moles = 6, so the ethanol mole fraction is 1 ÷ 6 = 1/6. Therefore option A is correct. Option C is the water mole fraction, and options B and D do not use the correct total.
Which subject and chapter does this question cover?
This is a Class 11 Chemistry question. Chapter: Chapter 01: Solutions.
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