Use bond enthalpies from Table 10.3 to determine whether CH₄(g), CH₃OH(g), H₂CO(g), or HCOOH(g) produces the most energy per gram when burned completely in O₂(g) to give CO₂(g) and H₂O(g). Is there any relationship between the oxidation state of carbon and the heat of combustion (in kJ kg^–1 or kJ mol^–1)?

Table 10.3

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TABLE 10.3 Some Average Bond Energiesa Bond Energy, kJ mol-¹ Bond Energy, kJ mol-¹ Bond H-H 436 H-C 414 H-N 389 H-O 464 H-S 368 H-F 565 H-Cl 431 H-Br 364 H-I 297 Bond C-C C=C C=C C-N C=N C=N C-O 347 611 837 305 615 891 360 C=O 736b C-Cl 339 Bond Energy, kJ mol-¹ Bond N-N 163 N=N 418 N=N 946 N-O 222 N=O 590 0-0 142 0=0 498 F-F CI-CI Br-Br I-I 159 243 193 151