159_fall_07_lecture_chapter_9_supp

159_fall_07_lecture_chapter_9_supp - Chapter 9 Models of...

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Ch 9 1 Chapter 9 Models of Chemical Bonding
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Ch 9 2 Models of Chemical Bonding 9.1 Atomic Properties and Chemical Bonds 9.2 The Ionic Bonding Model 9.3 The Covalent Bonding Model 9.4 Bond Energy and Chemical Change 9.5 Electronegativity and Bond Polarity
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Ch 9 3 Calculation of Lattice Energy For Solid Lithium Fluoride (1) LiF (s) Li(s) + ½ F 2 (g) - f (LiF(s)) = +616.9 kJ A-6 (2) Li(s) Li(g) f (Li(g)) = +161 kJ A-6 (3) Li(g) Li + (g) + e IE = +520 kJ Fig.8.18 (4) ½ F 2 (g) F(g) f (F(g)) = + 78.9 kJ A-6 (5) F(g) + e F (g) EA = -328 kJ Fig.8.20 LiF(s) Li + (g) + F (g) lattice = +1049 kJ (+616.9 +161+520+78.9-328) = +1049 kJ Note: Δ f (F(g)) is ½ the bond energy of F 2 (g) F 2 (g) 2F(g) Δ H° = BE of F 2 = 2x78.9 kJ = 157.8 kJ .8.14 8.12
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Ch 9 4 Calculation of Lattice Energy for Solid Magnesium Chloride (1) MgCl 2 (s) Mg(s) + Cl 2 (g) - H °f (MgCl 2 (s)) (2) Mg(s) Mg(g) H °f (Mg(g)) (3) Mg(g) Mg + (g) + e IE 1 (4) Mg + (g) Mg 2+ (g) + e IE 2 (5) Cl 2 (g) 2 Cl(g) 2 f (Cl(g)) (6) 2 Cl(g) + 2 e 2 Cl (g) 2 EA 1 ------------------------------------------------------------------------------- MgCl 2 (s) Mg 2+ (g) + 2 Cl (g) H°lattice Note:
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This note was uploaded on 04/03/2008 for the course CHEM 159-160 taught by Professor Zbaida during the Fall '07 term at Rutgers.

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159_fall_07_lecture_chapter_9_supp - Chapter 9 Models of...

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