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CHEMISTRY 121 1 Department of Chemistry University of British Columbia Problem Set 5 Consequences of Molecular Polarity 1. What is the predominant intermolecular force holding the Br 2 molecules together in the liquid state of bromine? 2. Which of the following compounds is expected to have the least hydrogen bonding: CH 4 , H 2 O, HF or NH 3 ? 3. What are the forces of attraction between I 2 molecules? 4. Arrange the following in order of increasing boiling point: RbCl, CH 3 Cl, CH 3 OH, CH 4 . 5. C 60 and C 84 are two of the fullerene allotropes of carbon pictured below. The boiling point of a liquid is determined by the temperature at which the vapour pressure of the liquid just equals the external atmospheric pressure. From what you know about what determines the boiling point of a liquid, which fullerene solid would you expect to have the higher vapour pressure? Explain your reasoning. C 60 C 84 6. Provide a rationale for the following observation. The boiling points of the Group
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