The vapor pressures of several solutions of water-propanol (CH 3 CH 2 CH 2 OH) were determined at various compositions, with the following data collected at 45°C: χ H 2 O Vapor pressure(torr) 0 74.0 0.15 77.3 0.37 80.2 0.54 81.6 0.69 80.6 0.83 78.2 1.00 71.9 a. Are solutions of water and propanol ideal? Explain. b. Predict the sign of ∆ H soln for water-propanol solutions. c. Are the interactive forces between propanol and water molecules weaker than, stronger than, or equal to the interactive forces between the pure substances? Explain. d. Which of the solutions in the data would have the lowest normal boiling point?
The vapor pressures of several solutions of water-propanol (CH 3 CH 2 CH 2 OH) were determined at various compositions, with the following data collected at 45°C: χ H 2 O Vapor pressure(torr) 0 74.0 0.15 77.3 0.37 80.2 0.54 81.6 0.69 80.6 0.83 78.2 1.00 71.9 a. Are solutions of water and propanol ideal? Explain. b. Predict the sign of ∆ H soln for water-propanol solutions. c. Are the interactive forces between propanol and water molecules weaker than, stronger than, or equal to the interactive forces between the pure substances? Explain. d. Which of the solutions in the data would have the lowest normal boiling point?
Solution Summary: The author explains that Raoult's law for ideal solution states that the mole tion of the solvent is directly proportional to the vapor pressure of a solution.
The vapor pressures of several solutions of water-propanol (CH3CH2CH2OH) were determined at various compositions, with the following data collected at 45°C:
χ
H
2
O
Vapor pressure(torr)
0
74.0
0.15
77.3
0.37
80.2
0.54
81.6
0.69
80.6
0.83
78.2
1.00
71.9
a. Are solutions of water and propanol ideal? Explain.
b. Predict the sign of ∆Hsoln for water-propanol solutions.
c. Are the interactive forces between propanol and water molecules weaker than, stronger than, or equal to the interactive forces between the pure substances? Explain.
d. Which of the solutions in the data would have the lowest normal boiling point?
How much of each solution should be
used to prepare 1L of a buffer
solution with a pH of 9.45 using 3M
Na2CO3 and 0.2M HCI? Given: Ka
1 = 4.3 × 10-7, Ka2 = 4.69 × 10-11
Add substituents to draw the conformer below (sighting down
the indicated bond), then rotate the back carbon to provide the
anti staggered conformer.
+
H3C
H
Ph
H
Problem 25 of 30
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what temperature does a 50% (mole
fraction) of ammonia/water liquid
mixture boil at 1 atm
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