What does it mean if the mole fraction of a component is 1?
Answer and explanation
Correct answer: All moles belong to that component
Mole fraction is defined as Xi = ni/ntotal, where ni is the amount of the selected component and ntotal is the sum of the amounts of every component. If Xi = 1, then ni/ntotal = 1, which requires ni = ntotal. Consequently, every mole counted in the sample belongs to that component, and the mole amounts of all other components are zero. Therefore option A is correct. A mole fraction of zero would indicate that the component is absent, not a value of one. A value of 0.5 would mean that the component contributes half of the total moles, although its mass need not be half. Mole fraction describes amount in moles, so option D is unrelated.
Frequently asked questions
What is the correct answer to this question?
All moles belong to that component
Why is this the correct answer?
Mole fraction is defined as Xi = ni/ntotal, where ni is the amount of the selected component and ntotal is the sum of the amounts of every component. If Xi = 1, then ni/ntotal = 1, which requires ni = ntotal. Consequently, every mole counted in the sample belongs to that component, and the mole amounts of all other components are zero. Therefore option A is correct. A mole fraction of zero would indicate that the component is absent, not a value of one. A value of 0.5 would mean that the component contributes half of the total moles, although its mass need not be half. Mole fraction describes amount in moles, so option D is unrelated.
Which subject and chapter does this question cover?
This is a Class 11 Chemistry question. Chapter: Chapter 01: Solutions.
