If the moles of solute and solvent in a solution are 2 and 3 respectively, what is the mole fraction of solute?
Answer and explanation
Correct answer: 0.4
The mole fraction of solute is calculated as moles of solute divided by the total moles in the solution. The word “respectively” assigns 2 mol to the solute and 3 mol to the solvent. Thus total moles = 2 + 3 = 5 mol, and xsolute = 2 ÷ 5 = 0.4. Option B is correct. The value 0.6 is the solvent mole fraction; 0.2 and 0.8 do not satisfy the required ratio.
Frequently asked questions
What is the correct answer to this question?
0.4
Why is this the correct answer?
The mole fraction of solute is calculated as moles of solute divided by the total moles in the solution. The word “respectively” assigns 2 mol to the solute and 3 mol to the solvent. Thus total moles = 2 + 3 = 5 mol, and xsolute = 2 ÷ 5 = 0.4. Option B is correct. The value 0.6 is the solvent mole fraction; 0.2 and 0.8 do not satisfy the required ratio.
Which subject and chapter does this question cover?
This is a Class 11 Chemistry question. Chapter: Chapter 01: Solutions.
