Choose the correct answer for each question.

1. Which response lists all the following pairs that are miscible liquids.
   Pair #1: octane (C₈H₁₈) and water
   Pair #2: acetic acid (CH₃COOH) and water
   Pair #3: octane (C₈H₁₈) and carbon tetrachloride (CCl₄)

   1.   ?    1, 3
   2.   ?    1, 2
   3.   ?    3
   4.   ?    2, 3
   5.   ?    2

2. What is the molarity of a solution of 10% cadmium sulfate, CdSO₄ (208.46g/mol) by mass? The density of the solution is 1.10g/mL.

   1.   ?    0.048 M
   2.   ?    0.436 M
   3.   ?    0.479 M
   4.   ?    0.528 M
   5.   ?    22.9 M

3. What is the percent CdSO₄ (208.46g/mol) by mass in a 1.0 molal aqueous solution?

   1.   ?    0.001%
   2.   ?    0.10%
   3.   ?    17.2%
   4.   ?    20.8%
   5.   ?    24.4%

4. In how many grams of water should 25.31g of potassium nitrate (KNO₃) be dissolved to prepare a 0.1982 molal solution?

   1.   ?    250.0g
   2.   ?    1263g
   3.   ?    792g
   4.   ?    1000g
   5.   ?    7917g

5. The solubility of nitrogen gas at 25^oC and a pressure of 522mmHg is 4.7x10^-4mol/L. What is the value of Henry's Law constant in mol/Latm?

   1.   ?    6.8x10^-4
   2.   ?    4.7x10^-4
   3.   ?    3.2x10^-4
   4.   ?    9.0x10^-7
   5.   ?    1.5x10³

6. The solubility of CO₂ gas in water:

   1.   ?    increases with increasing temperature
   2.   ?    decreases with decreasing temperature
   3.   ?    decreases with increasing temperature
   4.   ?    is not dependent upon temperature

7. According to Raoult's law, which statement is false?

   1.   ?    The vapor pressure of a solvent over a solution decreases as its mole fraction increases.
   2.   ?    The solubility of a gas increases as the temperature decreases
   3.   ?    The vapor pressure of a solvent over a solution is less than that of pure solvent
   4.   ?    The greater the pressure of a gas over a solution the greater its solubility
   5.   ?    Ionic solutes dissociate in solution causing an enhancement of all colligative properties.

8. What is the freezing point of a solution prepared from 50.0g ethylene glycol (C₂H₆O₂) and 85.0g H₂O?

   1.   ?    17.6^oC
   2.   ?    -176^oC
   3.   ?    -1.50^oC
   4.   ?    1.50^oC
   5.   ?    -17.6^oC

9. A solution that contains 55.0g of ascorbic acid in 250g of water freezes at -2.34^oC. Calculate the molar mass (g/mol) of the solute. K_f = 1.86^oC/m

   1.   ?    1.26
   2.   ?    10.9
   3.   ?    43.6
   4.   ?    175
   5.   ?    277

10. What is the osmotic pressure of a solution prepared from 13.7g of the electrolyte HCl and enough water to make 0.50L of solution at 18^oC?

    1.   ?    0.55 atm
    2.   ?    1.10 atm
    3.   ?    8.95 atm
    4.   ?    17.9 atm
    5.   ?    35.9 atm