[12.120] Employing the bond enthalpy values listed in Table estimate the molar enthalpy change occurring upon
Table Average Bond Enthalpies(kJ/mol)
Single Bonds | |||||||
C―H | 413 | N―H | 391 | O―H | 463 | F―F | 155 |
C―C | 348 | N―N | 163 | O—O | 146 |
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C―N | 293 | N―O | 201 | O―F | 190 | Cl―F | 253 |
C―O | 358 | N―F | 272 | O―Cl | 203 | Cl―Cl | 242 |
C―F | 485 | N―Cl | 200 | O―l | 234 |
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C―Cl | 328 | N―Br | 243 |
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| Br―F | 237 |
C―Br | 276 | S―H | 339 | Br―Cl | 218 |
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C―l | 240 | H―H | 436 | S―F | 327 | Br―Br | 193 |
C―S | 259 | H―F | 567 | S―Cl | 253 |
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| H―Cl | 431 | S—Br | 218 | I―Cl | 208 |
Si―H | 323 | H―Br | 366 | S—S | 266 | I―Br | 175 |
Si―Si | 226 | H―l | 299 |
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| I―l | 151 |
Si―C | 301 |
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Si―O | 368 |
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Si―Cl | 464 |
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Multiple Bonds | |||||||
C═C | 614 | N≡N | 418 | O≡O | 495 |
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C≡C | 839 | N═N | 941 |
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C═N | 615 | N≡O | 607 | S≡O | 523 |
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C≡N | 891 |
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| S≡S | 418 |
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C═O | 799 |
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C≡O | 1072 |
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(a) polymerization of ethylene, (b) formation of nylon 6,6, (c) formation of polyethylene terephthalate (PET).
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