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Unformatted text preview: Chemistry 102 Virginia Commonwealth University Summer 2007 Hour Exam 1 (100 pts) Name:_________________________ Multiple Choice (5 pts ea) 1) Which one of the following molecules has a net dipole moment? a) NH 3 b) SO 3 c) CO 2 d) XeF 2 2) What is the correct order of the following compounds, in terms of increasing boiling point? a) He<HF<CH 4 <C 2 H 6 b) He<CH 4 <C 2 H 6 <HF c) CH 4 <He<HF<C 2 H 6 d) HF<He<CH 4 <C 2 H 6 3) Ether has P vap = 400 mm Hg at 17.9C, and a normal boiling point of 34.6C, what is the heat of vaporization, H vap , for ether, in kJ/mol? a) 28.6 kJ/mol b) 3.44 kJ/mol c) 101.8 kJ/mol d) 0.349 kJ/mol 4) Liquids have a positive Hvap, meaning the vaporization of a liquid is endothermic and energetically unfavorable, yet liquids vaporize spontaneously at normal temperatures and pressures, why? a) Svap is negative and therefore vaporization is entropically favored....
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- Spring '08