Question: If the mole fraction of a solvent in a solution is 0.75, what is the vapor pressure of the solvent if its pure vapor pressure is 100 mmHg?

Options:

1. 75 mmHg
2. 100 mmHg
3. 25 mmHg
4. 50 mmHg

Correct Answer: 75 mmHg

Solution:

According to Raoult\'s Law, the vapor pressure of the solvent in the solution is 0.75 * 100 mmHg = 75 mmHg.