Calculate the following problem and box your final answer 1. The vapor pressure of pure water at 115°C is 1085 torr. A solution of ethylene glycol and water has a vapor pressure of 1.30 atm at the same temperature. What is the mole fraction of ethylene glycol in the solution?
Calculate the following problem and box your final answer 1. The vapor pressure of pure water at 115°C is 1085 torr. A solution of ethylene glycol and water has a vapor pressure of 1.30 atm at the same temperature. What is the mole fraction of ethylene glycol in the solution?
Chapter84: Fractional Distillation, Azeotropes
Section: Chapter Questions
Problem 2P
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Please based boiling point and kb to the given table below. Thank you
Transcribed Image Text:.Globe
10:37 PM
X Colligative Properties Activity...
ล
53%
Name:
Activity Sheet
Colligative Properties of Solution
Calculate the following problem and box your final answer
1. The vapor pressure of pure water at 115°C is 1085 torr. A
solution of ethylene glycol and water has a vapor pressure of
1.30 atm at the same temperature. What is the mole fraction of
ethylene glycol in the solution?
2. What is the molality of a solution dissolved in chloroform that
boils at 62.8 °C? Boiling point of chloroform is 62.2 °C? Kb
chloroform 3.63 °c/m?
3. Calculate the vapor pressure lowering, DP, when 10.0 mL of
glycerol (C,H,O) is added to 500. mL of water at 50. °C. At this
temperature, the vapor pressure of pure water is 92.5 torr and its
density is 0.988 g/mL. The density of glycerol is 1.26 g/mL.
4. You add 1.00 kg of ethylene glycol antifreeze (CHO) to your
car radiator, which contains 4450 g of water. What are the
boiling and freezing points of the resulting solution?
5. A solution of propylene glycol (antifreeze) in the cars radiator
has a freezing point of -20°C. What is the molarity of the
solution?
0
Transcribed Image Text:Facebook l
SOLUTION:
water.
1.00 x 103 g C2H602 X
solvent
16.1 mol C2H602
4.450 kg H20
D7b 0.512 oC/m x 3.62 m = 1.85 oC
BP = 101.85 oC
acetic acid
benzene
carbon disulfide
carbon tetrachloride
chloroform
water
Table 13.6 Molal Boiling Point Elevation and Freezing Point
Depression Constants of Several Solvents
diethyl ether
ethanol
*at 1 atm.
cdn.fbsbx.com
boiling
point (OC)*
mol C2H602
62.07 g C2H602
= 3.62 m C2H602
117.9
80.1
46.2
1:45 PM
76.5
61.7
34.5
78.5
100.0
Kb (oC/m)
3.07
2.53
2.34
5.03
3.63
2.02
1.22
= 16.1 mol C2H602
0.512
DTf 1.86 oC/m x 3.62 m
FP = -6.73 OC
melting
point (OC)
16.6
5.5
-111.5
-23
-63.5
-116.2
-117.3
31%
0.0
Done
Kf (oC/m)
3.90
4.90
3.83
30.
4.70
1.79
1.99
1.86
Colligative Properties - BP Elevation
Example: Calculate the boiling point of an aqueous
solution that contains 20.0 g ethylene glycol (C2H6O2, a
nonvolatile liquid). In 100 g of water
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