A solution is prepared by adding 20.00g of lactose (milk sugar) to 110.0g of water at 55°C. The partial pressure of water above the solutin is_______ torr. The vapor pressureof pure water at 55°C is 118 torr. tThe molar mass of lactose is 342.3 g/mol.

1.5 moles of solution X are added to a 2 liter container of water. The vapor pressure of water alone is 23.8 Hg at 25°C. What is the new vapor pressure of the solution?

A 41.3-gram sample of a solution of naph- thalene, C10H8(s), in benzene, C6H6(l ), has a vapor pressure at 20.0°Cof 63.9 Torr. The vapor pressure of pure benzene at 20.0°C is 75.0 Torr. Assuming that naphthalene has a negligible vapor pressure over the solution, use the vapor pressure–lowering expression to calculate the mole fraction of naphthalene and the number of grams of naphthalene in the solution.

Glycerin, C3H3O3, is a nonvolatile liquid. What is the vapor pressure of a solution made by adding 165 g glycerin to 338 mL H20 at 39.8°C? The vapor pressure of pure water at 39.8°C is 54.74 torr and its density is 0.992 g/em. Psoln torr

Calculate the freezing point of a solution containing 25.0 g. of ClF3 (MM = 92.45 g/mol) in 450. g. of water. The Kf of water is 1.86 °C/m. The freezing point of pure water is 0 ºC.

The vapor pressure of pure water at 25 ºC is 23.8 torr.  A chemist dissolves 97.2 grams of urea (a nonvolatile electrolyte; M.W. 60.0 g/mole) into 116.2 grams of water. What will now be the vapor pressure of this new aqueous solution at that same temperature?  <include no units in your answer>

The molarity of commercial HCl in water is 6.0 M and its density is 1.10g/cm3.   What is the mass percent of HCl?                 What is the molality of HCl?               What is the mole fraction of water?

The density of a glycerol/water solution that is 40.0% glycerol by mass is 1.101 g/mL at 20 degree C. Calculatethe molality and molarity of glycerol in the solution at 20 degree C. Calculate the molality at 0 degree C.

What is the vapor pressure of a saturated aqueous solution of sodium chlorideat 20oC ? The solution contains 35.7 g NaCl/100. mL water and water has a densityof 1.00 g/mL. The vapor pressure of pure water at this temperature is 17.54 torr.