CHM2046Quiz1 - o C e) 210 o C 4a. Calculate the mass of...

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Version A CHM2046.0001 Quiz 1 Answers underlined 1a. Gold crystallizes in a cubic close-packed structure (face-centered cubic unit cell). What is the net number of gold atoms in the unit cell? See text or notes a) 1 b) 4 c) 2 d) 6 e) 8 2a. Identify the predominant type of intermolecular force in each of the following compounds, and in the order shown. I. OF 2 ( polar ) II. CHF 3 ( polar ) III. HF ( H-F will form H-bonds ) a) Dispersion, H-bonding, Dipole-Dipole b) H-bonding, H-bonding, Dipole-Dipole c) Dipole-Dipole, Dipole-Dipole, H-bonding d) Dispersion, H-bonding, Ion-Dipole e) Dipole-Dipole, H-bonding, Dispersion 3a. Calculate the temperature of diethyl ether if its vapor pressure is 250 mmHg, and it has a vapor pressure of 401 mmHg at 18 o C. ( H vap = 26 kJ/mol) Solve for T 2 a) 27 o C b) -79 o C c) 5.6 o C d) 14
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Unformatted text preview: o C e) 210 o C 4a. Calculate the mass of water that can be vaporized with 434 kJ of heat at 100C. H vap of H 2 O = 40.7 kJ/mol a) 70.1 g b) 192 g c) 48.9 g d) 151 g e) 124 g 5a. Rank the following compounds below in order of decreasing vapor pressure, that is, from highest to lowest: H 2 , CH 3 OH, CH 4 ( O-H in CH 3 OH will form H-bonds, plus highest molar mass, lead to lowest VP; others are nonpolar ) a) H 2 , CH 3 OH, CH 4 b) CH 3 OH, H 2 , CH 4 c) CH 4 , CH 3 OH, H 2 d) H 2 , CH 4 , CH 3 OH e) CH 3 OH, CH 4 , H 2 End. . O H g 192 O H mol 1 g 8.02 1 kJ 40.7 O H mol 1 kJ 4 43 2 2 2 = = 2 4 1 K 291 1 . K J/mol 3145 . 8 J/mol 10 6 . 2 401 250 ln T...
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This note was uploaded on 09/21/2009 for the course CHM 2046 taught by Professor Dixon during the Spring '08 term at University of Central Florida.

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