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# hw4 - 2(a CFCs have been implicated in ozone depletion Show...

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3.091 Fall Term 2004 Homework #4 September 28 (for weekly quiz on Tuesday, October 5) From the text, Chapter 5: 5, 47, 49, 51, 55 (2 nd ed.); 5, 23, 25, 27, 31 (1 st ed.) Chapter 4: 34, 37, 42, 51, 59, 86, 87, 88, 111, 113, A5, A6 (2 nd ed.); 17, 20, 26, 35, 43, 57, 58, 59, 75, 77, A-2 and A-3 (1 st ed.). Additional questions: 1. Estimate the ionic radius of Cs + . The lattice energy of CsCl is 633 kJ/mol. For CsCl the Madelung constant is 1.763, and the Born exponent, n, is 10.7. The ionic radius of Cl is known to be 1.81 Å.
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Unformatted text preview: 2. (a) CFCs have been implicated in ozone depletion. Show that when Freon 12 (CCl 2 F 2 ) is exposed to ultraviolet radiation, the compound decomposes to produce chlorine. (b) Draw the Lewis structure of Freon 12 and indicate the polarities of each bond within this compound. (c) Determine the percent ionic character of the C-Cl and C-F bonds. DATA: Average Bond Energies (kJ/mol) Single Bonds Multiple Bonds H–H 435 C=C 610 F–F 155 C ≡ C 836 Cl–Cl 242 C–C 347...
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