Question: If the vapor pressure of pure solvent is 80 mmHg and the mole fraction of the solvent in the solution is 0.75, what is the vapor pressure of the solution?

Options:

1. 60 mmHg
2. 80 mmHg
3. 75 mmHg
4. 20 mmHg

Correct Answer: 60 mmHg

Solution:

Using Raoult\'s Law, P_solution = X_solvent * P_solvent^0 = 0.75 * 80 mmHg = 60 mmHg.