If the mole ratio of solute to solvent is 1:4, what is the mole fraction of solute?
Answer and explanation
Correct answer: 0.20
Mole fraction of a component equals its moles divided by the total moles of all components. Represent the ratio by 1 mol solute and 4 mol solvent; total moles are therefore 5. Solute mole fraction = 1/5 = 0.20, so option A is correct. The value 0.80 is the solvent mole fraction, while 0.25 incorrectly uses the solvent amount as the denominator.
Frequently asked questions
What is the correct answer to this question?
0.20
Why is this the correct answer?
Mole fraction of a component equals its moles divided by the total moles of all components. Represent the ratio by 1 mol solute and 4 mol solvent; total moles are therefore 5. Solute mole fraction = 1/5 = 0.20, so option A is correct. The value 0.80 is the solvent mole fraction, while 0.25 incorrectly uses the solvent amount as the denominator.
Which subject and chapter does this question cover?
This is a Class 11 Chemistry question. Chapter: Some Basic Concepts of Chemistry. Topic: Percentage composition and empirical/molecular formulas.
