2. A solution contains the same mass of two substances, substance A, which weights 200 g, and substance B, which weights 50 g. What is the mole fraction of substance A in this solution?
1/5 1/4 4/5 5/4 2/3
3. 64 g of a nonvolatile nonelectrolye is dissolved in 2705 g H2O.
11 g 22 g 44 g 66 g 5 g
4. Which of the following are colligative properties?
Boiling Point Elevation Freezing Point Depression Osmotic Pressure Vapor Pressure Law All of the above
5. Calculate the pressure needed to prevent osmosis when 10.0 g KCl is added to 150 mL of water at 25oC.
20.1 atm 40.1 atm 65.7 atm 80.2 atm 160 atm
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