Solutions Problems Help!!!!

Calculate the molality of a solution of 38.9 g of CaCl2 in 300. g of water.
Answer example: 1.45E-3 or 0.00145

Calculate the molarity of a solution made by taking 45.0 mL of 4.08 M. KNO3 and diluting it to a final volume of 195. mL.
Answer example: 1.45E-3 or 0.00145


A natural alcohol has been isolated by an ethnobotanist working in the Amazon. A solution of 6.26 g of this alcohol in 240. g of chloroform freezes at -64.5 oC. What is the molar mass of this substance? The freezing point depression constant of this solvent is 4.68 oC/m while the freezing point is -63.5 oC.
Answer example: 285

A 32.5 % by mass solution of propanol, CH3CH2CH2OH, in water is found to have a density of 1.04 g/mL. What is the molarity of this solution given these measurements?
Answer example: 3.45


Calculate the vapor pressure of water above a solution prepared by adding 40.9 g. of lactose (C12H22O11) to 100.0 g. of water at 18.0 oC. The vapor pressure of water at this temperature is 15.5 torr.
Answer example: 3.451