Chapter 17 Phase Equilibrium And Solutions Test Bank - Chemistry 3 4e | Test Bank Burrows by Andrew Burrows. DOCX document preview.
Chapter 17: Phase Equilibrium and Solutions
Test Bank
Type: multiple choice question
Title: Chapter 17 Question 01
1) An ice skater exerts a pressure of 3.1 MPa. Calculate the change in the melting point of the ice under the skate, given that the densities of liquid water and ice are 0.998 and 0.920 g cm–3 respectively and the enthalpy of fusion of water is +6.01 kJ mol–1.
Section reference: 17.2
a. An increase of 0.22 K
b. A decrease of 0.22 K
c. An increase of 4.6 K
d. A decrease of 4.6 K
Type: multiple choice question
Title: Chapter 17 Question 02
2) Determine the vapour pressure of diethyl ether, C4H10O, at a temperature of 298 K, given that the normal boiling temperature is 308 K and enthalpy of vaporization is 25.9 kJ mol–1.
Section reference: 17.2
a. 34.4 kPa
b. 142 kPa
c. 101 kPa
d. 72.2 kPa
Type: multiple choice question
Title: Chapter 17 Question 03
3) The normal boiling temperature of trichloromethane, CHCl3, is 61°C, and the specific enthalpy of vaporization is 250 J g–1. Determine the vapour pressure at a temperature of 298 K.
Section reference: 17.2
a. 63.6 kPa
b. 67.6 kPa
c. 68.5 kPa
d. 101 kPa
Type: multiple choice question
Title: Chapter 17 Question 04
4) The vapour pressure of pyridine, C5H5N, is 2.25 kPa at 25°C. Determine the normal boiling temperature of pyridine if the enthalpy of vaporization is 40.3 kJ mol–1.
Section reference: 17.2
a. 1001 K
b. 2.1°C
c. 389 K
d. 166°C
Type: multiple choice question
Title: Chapter 17 Question 05
5) The vapour pressure of pure 1-propanol is 2792 Pa at 25°C and 11995 Pa at 50°C. Determine the enthalpy of vaporization of 1-propanol.
Section reference: 17.2
a. 606 J mol–1
b. 10.1 kJ mol–1
c. 46.7 kJ mol–1
d. 5.62 kJ mol–1
Type: multiple choice question
Title: Chapter 17 Question 06
6) The vapour pressure of pure benzene is 0.146 bar and of pure toluene is 0.185 bar at 298 K. Determine the mole fraction of toluene in an ideal liquid mixture of benzene and toluene for which the total vapour pressure is 0.160 bar at this temperature.
Section reference: 17.4
a. 56.1%
b. 35.9%
c. 96.7%
d. 8.75%
Type: multiple choice question
Title: Chapter 17 Question 07
7) The Henry’s law constant for nitrogen dissolved in water at 298 K is 8.68 × 109 Pa. Determine the mole fraction of nitrogen in water in equilibrium with air at a pressure of 1 atm and temperature of 298 K.
Section reference: 17.4
a. 9.10 ppm
b. 11.0 ppm
c. 8.98 ppm
d. 7.90 ppm
Type: multiple choice question
Title: Chapter 17 Question 08
8) What is the osmotic pressure generated at 25°C by a solution of 1.26 g of sucrose, C12H22O11, in 250 cm3 of water?
Section reference: 17.4
a. 3.06 kPa
b. 36.4 kPa
c. 12.5 kPa
d. 1.05 kPa
Type: multiple choice question
Title: Chapter 17 Question 09
9) Determine the mass of potassium chloride, KCl, that must be added to water to create an aqueous solution of volume 25 dm3 with an osmotic pressure of 1.0 bar.
Section reference: 17.4
a. 120.5 g
b. 1.01 g
c. 25.0 g
d. 75.3 g
Type: multiple choice question
Title: Chapter 17 Question 10
10) Trichloromethane, CHCl3, and propanone, C3H6O, form liquid–vapour mixtures with a maximum-boiling azeotrope. What does this imply about the nature of the interactions between the molecules in the mixture?
Section reference: 17.4
a. Strong interactions between molecules make it more difficult for them to escape from the liquid to the vapour phase.
b. The interactions between the molecules in the mixture are the same strength as those of the pure components.
c. Weak interactions between the molecules increase the vapour pressure.
d. It is not possible to infer anything about the nature of the interactions.
Type: multiple choice question
Title: Chapter 17 Question 11
11) Determine the vapour pressure of n-hexane, C6H14, at a temperature of 298 K, given that the normal boiling temperature is 342 K and enthalpy of vaporization is 30.9 kJ mol–1.
Section reference: 17.2
a. 20.4 kPa
b. 504 kPa
c. 101 kPa
d. 29.4 kPa
Type: multiple choice question
Title: Chapter 17 Question 12
12) Determine the vapour pressure of toluene, C7H8, at a temperature of 350 K, given that the normal boiling temperature is 384 K and enthalpy of vaporization is 37.1 kJ mol–1.
Section reference: 17.2
a. 313 kPa
b. 32.8 kPa
c. 101 kPa
d. 3.5 kPa
Type: multiple choice question
Title: Chapter 17 Question 13
13) Determine the vapour pressure of acetone, C3H6O, at a temperature of 298 K, given that the normal boiling temperature is 329 K and enthalpy of vaporization is 31.3 kJ mol–1.
Section reference: 17.2
a. 30.8 kPa
b. 333 kPa
c. 101 kPa
d. 15.9 kPa
Type: multiple choice question
Title: Chapter 17 Question 14
14) Estimate the increase in the vapour pressure of octane, C8H18, from when the temperature is 298 K to when the temperature is 308 K. The normal boiling temperature is 329 K and enthalpy of vaporization is 31.3 kJ mol–1.
Section reference: 17.2
a. 1.54 kPa
b. 2.63 kPa
c. 99.4 kPa
d. 1.09 kPa
Type: multiple choice question
Title: Chapter 17 Question 15
15) Estimate the change in the vapour pressure of α-pinene, C10H16, from when the temperature is 323 K to when the temperature is 273 K. The normal boiling temperature is 430 K and enthalpy of vaporization is 45.4 kJ mol–1.
Section reference: 17.2
a. An increase of 1.44 kPa
b. A decrease of 1.44 kPa
c. An increase of 1.51 kPa
d. A decrease of 1.51 kPa
Type: multiple choice question
Title: Chapter 17 Question 16
16) The vapour pressure of ethanol, C2H6O, is 7.4 kPa at 25°C. Determine the normal boiling temperature of ethanol if the enthalpy of vaporization is 42.3 kJ mol–1.
Section reference: 17.2
a. 352 K
b. 242 K
c. 877 K
d. 320 K
Type: multiple choice question
Title: Chapter 17 Question 17
17) The vapour pressure of methanol, CH4O, is 27.5 kPa at 308 K. Determine the normal boiling temperature of ethanol if the enthalpy of vaporization is 37.6 kJ mol–1.
Section reference: 17.2
a. 365 K
b. 240 K
c. 633 K
d. 338 K
Type: multiple choice question
Title: Chapter 17 Question 18
18) The vapour pressure of pure cyclohexane is 12.2 kPa at 25°C and 25.1 kPa at 42°C. Determine the enthalpy of vaporization of cyclohexane.
Section reference: 17.2
a. 1240 J mol–1
b. 33.1 kJ mol–1
c. 28.6 kJ mol–1
d. 7.78 kJ mol–1
Type: multiple choice question
Title: Chapter 17 Question 19
19) The vapour pressure of pure aniline is 1314 Pa at 350 K and 13372 Pa at 400 K. Determine the enthalpy of vaporization of aniline.
Section reference: 17.2
a. 550 kJ mol–1
b. 101 kJ mol–1
c. 53.9 kJ mol–1
d. 29.4 kJ mol–1
Type: multiple choice question
Title: Chapter 17 Question 20
20) The Henry’s law constant for carbon dioxide dissolved in water at 298 K is 0.163 × 109 Pa. Determine the mole fraction of carbon dioxide in water in equilibrium with air at a pressure of 1 atm and temperature of 298 K, assuming the proportion of carbon dioxide in dry air is 0.04%.
Section reference: 17.4
a. 2.6 ppm
b. 25 ppm
c. 5.0 ppm
d. 12.4 ppm
Type: multiple choice question
Title: Chapter 17 Question 21
22) What is the osmotic pressure generated at 25°C by a solution of 2.50 g of glucose, C6H12O6, in 500 cm3 of water at 298 K?
Section reference: 17.4
a. 27.8 kPa
b. 68.8 kPa
c. 34.4 kPa
d. 10.3 kPa
Type: multiple choice question
Title: Chapter 17 Question 22
23) Determine the mass of sodium chloride, NaCl, that must be added to water to create an aqueous solution of volume 0.50 dm3 with an osmotic pressure of 1.0 atm at 298 K.
Section reference: 17.4
a. 1.19 g
b. 4.09 g
c. 5.85 g
d. 8.43 g
Type: multiple choice question
Title: Chapter 17 Question 23
24) 0.10 g of a protein is added to 250 cm3 water at 298 K and the osmotic pressure is measured as 255 Pa. Estimate the relative molecular mass of the protein.
Section reference: 17.4
a. 1579 g mol−1
b. 3540 g mol−1
c. 250.5 g mol−1
d. 3884 g mol−1
Type: multiple choice question
Title: Chapter 17 Question 24
24) 0.40 g of a protein is added to 100 cm3 water at 298 K and the osmotic pressure is measured as 185 Pa. Estimate the relative molecular mass of the protein.
Section reference: 17.4
a. Approx 54,000 g mol−1
b. Approx 32,000 g mol−1
c. 15,690 g mol−1
d. 22,500 g mol−1
Type: multiple choice question
Title: Chapter 17 Question 25
25) 0.25 g of a protein is added to 250 cm3 water at 298 K and the osmotic pressure is measured as 320 Pa. Estimate the relative molecular mass of the protein.
Section reference: 17.4
a. Approx 4,000 g mol−1
b. Approx 22,000 g mol−1
c. Approx 7700 g mol−1
d. Approx 13,500 g mol−1