According to raoults law which statement is false a

32. According to Raoult's law, which statement is false ?
A. The vapor pressure of a solvent over a solution decreases as its mole fraction increases.
B. The solubility of a gas increases as the temperature decreases.
C. The vapor pressure of a solvent over a solution is less than that of pure solvent.
D. The greater the pressure of a gas over a solution the greater its solubility.
E. Ionic solutes dissociate in solution causing an enhancement of all colligative properties.
33. Which of the following aqueous solutions has the highest boiling point?
7

34. Calculate the percent by mass of potassium nitrate in a solution made from 45.0 g KNO
3
and 295 mL of
water. The density of water is 0.997 g/mL.
35. Calculate the molality of a 20.0% by mass ammonium sulfate (NH
4
)
2
SO
4
solution. The density of the
solution is 1.117 g/mL.
36. Arrange the following aqueous solutions in order of increasing boiling points.
0.050 m Mg(NO
3
)
2
; 0.100 m ethanol; 0.090 m NaCl
A. Mg(NO
3
)
2
< NaCl < ethanol
B. ethanol < Mg(NO
3
)
2
< NaCl
C. ethanol < NaCl < Mg(NO
3
)
2
D. NaCl < ethanol < Mg(NO
3
)
2
E. Mg(NO
3
)
2
< ethanol < NaCl
37. The density of a 20.3 M CH
3
OH (methanol) solution is 0.858 g/mL. What is the molality of this solution?
H
2
O is the solvent.
A. 17.4 m
B. 20.8 m
C. 23.7 m
D. 70.0 m
E. 97.6 m
38.
Calculate the approximate freezing point of a solution made from 21.0 g NaCl and 1.00 × 10
2
g of H
2
O.
[K
f
of water is 1.86 ° C/m.]
8

39. What is the molarity of a solution of 10% by mass cadmium sulfate, CdSO
4
(molar mass = 208.46 g/mol)
by mass? The density of the solution is 1.10 g/mL.
40.
The osmotic pressure of a 0.010 M MgSO
4
solution at 25 ° C is 0.318 atm. Calculate i , the van't Hoff
factor, for this MgSO
4
solution.
41. The solubility of gases in water usually decreases with
A. increasing pressure.
B. increasing temperature.
C. decreasing temperature.
42. Which of the following compounds should be soluble in CCl
4
? 43. What is the percent CdSO
4
by mass in a 1.0 molal aqueous CdSO
4
solution? 44. Calculate the molality of 6.0 M H
2
SO
4
solution. The density of the solution is 1.34 g/mL.
9

45. Calculate the molality of a solution containing 14.3 g of NaCl in 42.2 g of water.
A.
2.45 × 10
-4
B.
5.80 × 10
-4
C.
2.45 × 10
-1
D. 103 m
E. 5.80 m
m
m
m
46. What volume of water should be added to 600. mL of ethanol in order to have a solution that boils at
95.0 ° C?
[For ethanol, K
b
= 1.22 ° C/m, density = 0.789 g/cm
3
, boiling point = 78.4 ° C]