A solution contains 2 moles solute and 8 moles solvent. What is the mole percent of solute?
Answer and explanation
Correct answer: 20%
Mole percent is calculated from the mole fraction: mole percent of solute = (moles of solute / total moles) × 100. The total number of moles is 2 + 8 = 10 mol, so the solute mole fraction is 2/10 = 0.20. Therefore, mole percent = 0.20 × 100 = 20%, making option A correct. Option C is the solvent mole percent, while 25% and 10% result from incorrect denominators.
Frequently asked questions
What is the correct answer to this question?
20%
Why is this the correct answer?
Mole percent is calculated from the mole fraction: mole percent of solute = (moles of solute / total moles) × 100. The total number of moles is 2 + 8 = 10 mol, so the solute mole fraction is 2/10 = 0.20. Therefore, mole percent = 0.20 × 100 = 20%, making option A correct. Option C is the solvent mole percent, while 25% and 10% result from incorrect denominators.
Which subject and chapter does this question cover?
This is a Class 11 Chemistry question. Chapter: Chapter 01: Solutions.
