Answered: Describe the intermolecular forces that…

Chemistry: An Atoms First Approach

2nd Edition

ISBN:9781305079243

Author:Steven S. Zumdahl, Susan A. Zumdahl

Publisher:Steven S. Zumdahl, Susan A. Zumdahl

Chapter9: Liquids And Solids

Section: Chapter Questions

Problem 117AE

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Question

1. Describe the intermolecular forces that must be overcome to convert each of the
following from a liquid to a gas:

a) Br2

b) CH3OH

c) H2S

2. A mixture consists of 78,1 g benzene (C6H6) and 92,1 g toluene (C7H8). Both substances
are volatile, and their vapour pressures (in the pure form) are as follows at 20°C:

Benzene: 0.0988 atm
Toluene: 0.0287 atm

a) Which substance, benzene or toluene, would have the lowest boiling point in the
pure form? Give a reason or your answer.

b) Calculate the vapour pressure of the benzene-toluene mixture at 20°C.

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