Consider benzene (C6H6) in the gas phase.
(a) Write the reaction for breaking all the bonds in C6H6 (g), and use data in Appendix C to determine the enthalpy change for this reaction.
(b) Write a reaction that corresponds to breaking all the carbon-carbon bonds in C6H6 (g).
(c) By combining your answers to parts (a) and (b) and using the average bond enthalpy for from Table 8.4, calculate the average bond enthalpy for the carbon-carbon bonds in C6H6(g).
(d) Comment on your answer from part (c) as compared to the values for single bonds and double bonds in Table 8.4.

TABLE 8.4.Average Bond Enthalples (kJ/mol) Single Bonds 413 348 293 358 485 328 276 240 259 463 146 190 203 234 F-F C-H - C-N C-O C-F N-H N- N N-O N-F N-C 200 OI N Br 39 O-H 163 0-O 201 O-F 272 155 Cl-F CI-CI 253 242 O-Cl 243 Br -F Br-cl Br Br 237 218 193 C-Br s--H 339 327 253 218 266 H-H 436 S-F 567 S-Cl 431 366 S-S 299 H-Cl H-Br S-Br I-CI I-Br 208 175 151 Si-H Si-Si Si-C Si-o Si-Cl 323 226 301 368 464 Multiple Bonds 614 839 615 891 799 072 418 941 607 S-O 495 N- N 523 418 C-N C O