10-17 - Bond Energies Reactants Products Components of a...

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Unformatted text preview: Bond Energies Reactants Products Components of a chemical reaction: Break Bonds Between Atoms Make New Bonds Between Different Atoms requires energy endothermic H>0 gives off energy exothermic H<0 Section 9.4 H rxn ~ # (broken bond) xD (broken bond) # (formed bond) xD (formed bon Table 5 Common bond energies (kJ/mol) From online CAMS, D. Wertz C-H 413 N-H 391 O-H 463 H-H 436 C-F 485 N-F 272 O-F 190 H-F 565 F-F 159 C-Cl 328 N-Cl 200 O-Cl 203 H-Cl 431 Cl-Cl 243 C-Br 276 N-Br 243 O-Br 235 H-Br 366 Br-Br 193 C-I 234 O-I 234 H-I 299 I-I 151 C-C 347 N-N 163 C-N 293 C-O 358 O-O 146 C=C 612 N=N 418 C=N 615 C=O 799 O=O 495 C C 820 N N 941 C N 891 C O 1072 H C C C C H H H H H H C C C C H H H H H H H + H H Estimate H for the following rxn reactants product Section 9.4 Circle what doesnt change and ignore it n ~ # (broken bond) xD (broken bond) # (formed bond) xD (formed H rxn ~ +(C C) + (H-H)- (C=C) - 2(C-H) H rxn ~ + (820) + (436)- (612) - 2(413) ~ -182 kJ H C C C C H H H H H H C C C C H H H H H H H + H H Estimate H for the following rxn Section 9.4 Or, if it bothers you to spot changes, just break every reactant bond and make every product bond n ~ # (broken bond) xD (broken bond) # (formed bond) xD (formed H rxn ~ 6(C-H) + 2(C-C) + (C C) + (H-H)- 8(C-H) 2(C-C) - (C=C) 2 H rxn ~ +(C C) + (H-H)- (C=C) - 2(C-H) H ~+(N N) + 3(H-H)- 6(N-H) Estimate H for the following rxn H ~ + (941) + 3(436)- 6(391) ~ -97 kJ Section 9.4 products reactants N N H H H H H H N H H H N H H H Lewis Structure Needed! + Estimate H for the following rxn H = -97 kJ per 2 mol NH 3 (g) produced Section 9.4 + H = -97 kJ per 3 mol H 2 (g) consumed H = -97 kJ per 1 mol N 2 (g) consumed Thermodynamics Kinetics Energy content of reactants & products Will the rxn happen?...
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10-17 - Bond Energies Reactants Products Components of a...

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