5. What is the mole fraction of a 25% by mass sucrose solution? 6. Find the molality of problem #5. 7. Determine the freezing and boiling point of 5.15 g acetic acid in 150 g water. 8. If 85.5 g of a nonelectrolyte dissolved in water has a freezing point of -0.465C, what is the molecular weight of the solute? 9. A solution is prepared by dissolving 35.0 g of hemoglobin in enough water to make up 1.00 L in volume. The osmotic pressure of the solution is found to be 10.0 mmHg at 25.0 C. Calculate the molar mass of hemoglobin. 10. What is the vapor pressure lowering of 2.5 moles of sucrose that is placed in 1 kg water?