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Lecture 4

CHM135H1 Lecture Notes - Lecture 4: Boiling Point, Benzene, Vapor Pressure


Department
Chemistry
Course Code
CHM135H1
Professor
Dvira Segal
Lecture
4

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CHM 139H TUTORIAL 4
You should be able to do any of the following questions from the course textbook, McMurry
and Fay (6th Edition). You may not need to do all of the questions! Do as many or as few as
you feel is necessary to achieve an understanding of the course material to date. You are the
best judge of your own learning!
Please note that the questions given below have full solutions in the Student Solutions
Manual.
Suggested problems for practice:
Chapter 10 (even-numbered questions only): 10.2, 10.6, 10.12, 10.16, 10.18, 10.24, 10.26,
10.32 10.38, 10.46, 10.50, 10.52, 10.54, 10.60, 10.74, 10.82, 10.86, 10.90 10.100,
10.122 10.130, 10.134(!), 10.136.
Chapter 11 (even-numbered questions only): 11.4 11.10, 11.14 11.20, 11.24, 11.26,
11.38, 11.40, 11.42, 11.48 11.66, 11.76, 11.80 11.84, 11.88 11.108, 11.114,
11.118, 11.124, 11.130 11.138.
Of the above, the following represent some of the better questions:
Chapter 10: 10.38, 10.92, 10.94, 10.124, 10.128, 10.134(!), 10.136.
Chapter 11: 11.90, 11.106, 11.124, 11.130, 11.136, 11.138.
In addition, the following problems will also be discussed in the CHM139 tutorials:
1. When another atom or group of atoms is substituted for one of the hydrogen atoms in
benzene, C6H6, the boiling point changes. Explain the order of the following boiling points:
C6H6, 80°C; C6H5Cl, 132°C; C6H5Br, 156°C; C6H5OH, 182°C.
2. (a) What are the partial and total vapour pressures of a solution obtained by mixing 35.8 g
benzene, C6H6 (l), and 56.7 g toluene, C7H8 (l), at 25 °C? At 25 °C, the vapour pressure of
liquid C6H6 = 95.1 mmHg; the vapour pressure of liquid C7H8 = 28.4 mmHg.
(b) Determine the mole fraction of benzene in the vapour above this benzenetoluene
solution.
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