Use bond energies (Table 9.5) to estimate H for the following gas-phase reaction. This is called an

Use bond energies (Table 9.5) to estimate ˆ†H for the following gas-phase reaction.

This is called an €œaddition€ reaction, because a compound (HBr) is added across the double bond.

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C=C + H-Br → H-C-C-Br TABLE 9.5 Bond Energies (in kJ/mol)* Single Bonds 0 H 432 C 4 346 N 386 305 16? 0 459 358 201 142 S 363 272 226 F 565 485 283 190 284 155 CI 428 327 313 218 255 249 240 Br 362 28520 217249 216 190 I295 213 201-- 278 208 175 149 Multiple Bonds С-С 602 C_N 615 C-0 C C 835 C N 887 C 0 N- 418 N-O 607 S-O (in S02) 532 N N 942 0-0 494 S- (in SO) 469 2 745 (799 in CO2) 1072