A solution contains 0.2 mol solute and 0.8 mol solvent. What is the mole fraction of solute?
Answer and explanation
Correct answer: 0.20
The mole fraction of a component is its moles divided by the total moles of every component in the solution. Here, total moles = 0.2 + 0.8 = 1.0 mol. Therefore, solute mole fraction = 0.2/1.0 = 0.20, making option B correct. Option D is the solvent mole fraction because 0.8/1.0 = 0.80. The value 0.25 would incorrectly divide by only the solvent amount.
Frequently asked questions
What is the correct answer to this question?
0.20
Why is this the correct answer?
The mole fraction of a component is its moles divided by the total moles of every component in the solution. Here, total moles = 0.2 + 0.8 = 1.0 mol. Therefore, solute mole fraction = 0.2/1.0 = 0.20, making option B correct. Option D is the solvent mole fraction because 0.8/1.0 = 0.80. The value 0.25 would incorrectly divide by only the solvent amount.
Which subject and chapter does this question cover?
This is a Class 11 Chemistry question. Chapter: Chapter 01: Solutions.
