chem2final

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1. A solution is prepared by dissolving 98.6 g of NaCl in enough water to form 875 mL of solution. Calculate the mass % of the solution if the solution density is 1.06 g/mL.
a. 11.3%
b. 12.7%
c. 9.4%
d. 10.6%
e. 11.9 %

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10.6%

2. Calculate the freezing point of a solution of 500.0 g of ethylene glycol (C2H6O2) dissolved in 500.0 g of water. Kf of H2O is 1.86 °C/m.
a. 30.0 °C
b. −30.0 °C
c. 8.32 °C
d. −8.32 °C
70.2 °C

-30.0 °C

3. A solution of sucrose in water is in equilibrium with solid sucrose. If more solid sucrose is now added, with stirring,
a. the concentration of the solution will increase.
b. the concentration of the solution will decrease.
c. the concentration of the solution will remain the same.
d. the volume of the solution will increase.
e. a supersaturated solution will be produced.

the concentration of the solution will remain the same.

4. A solution is prepared by adding 30.00 g of lactose (milk sugar) to 110.0 g of water at 55 °C. the partial pressure of water above the solution is ___________ torr. The vapor pressure of water at 55 °C is 118.0 torr. (Mlactose = 342.3 g/mol)
a. 1.670
b. 94.1
c. 169.4
d. 116.3
e. 92.7

116.3

5. What is the density of an aqueous solution of potassium nitrate (KNO3) that has a normal boiling point of 103.0 °C and an osmotic pressure of 122 atm at 25 °C? Kb of H2O is 0.52 °C/m.
a. 1.10 g/mL
b. 1.59 g/mL
c. 2.55 g/mL
d. 2.49 g/mL
e. 2.92 g/mL

1.10 g/mL