The mole fraction of solute in a solution is 0.3. What is the mole fraction of solvent if there are only two components?
Answer and explanation
Correct answer: 0.70
The governing concept is that the mole fractions of all components in a solution add up to 1. Since this is a binary solution, x_solute + x_solvent = 1. Substituting x_solute = 0.30 gives x_solvent = 1 − 0.30 = 0.70. Therefore, option C is correct. Option A repeats the solute fraction, option B does not complete the total to one, and option D is impossible because a mole fraction cannot exceed 1.
Frequently asked questions
What is the correct answer to this question?
0.70
Why is this the correct answer?
The governing concept is that the mole fractions of all components in a solution add up to 1. Since this is a binary solution, x_solute + x_solvent = 1. Substituting x_solute = 0.30 gives x_solvent = 1 − 0.30 = 0.70. Therefore, option C is correct. Option A repeats the solute fraction, option B does not complete the total to one, and option D is impossible because a mole fraction cannot exceed 1.
Which subject and chapter does this question cover?
This is a Class 11 Chemistry question. Chapter: Chapter 01: Solutions.
