103108 - 812 kJ/mol 1.20 Å Enthalpy of Reaction from Bond...

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Formation of an Ionic Solid
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Lattice Energy
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Estimating Heat of Formation y Use the following data to estimate Δ H o f for magnesium fluoride: { Mg (s) + F 2(g) Æ MgF 2 (s) Lattice Energy -3916 kJ/mol 1 st Ionization Energy Mg 735 kJ/mol 2 nd Ionization Energy Mg 1445 kJ/mol Electron Affinity of F -328 kJ/mol Bond Energy of F 2 154 kJ/mol Enthalpy of Sublimation of Mg 150. kJ/mol
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Covalent Bonds
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Bond Energies y The energy required to break a bond { HCl H + Cl H = bond energy > zero
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Multiple Bonds H(B.E.) bond distance C-C 348 kJ/mol 1.54 Å C=C 614 kJ/mol 1.33 Å C C
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Unformatted text preview: 812 kJ/mol 1.20 Å Enthalpy of Reaction from Bond Energy y Bond breaking is endothermic y Bond making is exothermic Average Bond Energies Sample Problem y Estimate the enthalpy of reaction for the following reaction: H-C ≡ N (g) + 2 H 2 (g) → H 3 CNH 2 (g) Average Bond Lengths Sample Problem y The space shuttle orbiter utilizes the oxidation of methyl hydrazine by dinitrogen trioxide for propulsion: { 5 N 2 O 4 (l) + 4 N 2 H 3 CH 3 (l) Æ 12 H 2 O (l) + 9 N 2 (g) + 4 CO 2 (g)...
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This note was uploaded on 12/06/2009 for the course CHEM 105A taught by Professor Bau during the Fall '04 term at USC.

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103108 - 812 kJ/mol 1.20 Å Enthalpy of Reaction from Bond...

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