TABLE 9.4 Bond Energies (kJ/mol)* Single Bonds C-H 414 C-C 348 C-N 293 C-O 351 C

Question

TABLE 9.4 Bond Energies (kJ/mol)* Single Bonds C-H 414 C-C 348 C-N 293 C-O 351 C-F 439 C-CI 328 C-Br 276 C-1 238 C-S 259 N-H 889O H 463 FF 159 N-N 163OO 146 C F 253 N-O 201O-F 190 CCI 242 N-F 272 O-C203Br-F 237 N-CI 200 O-I234Br-Cl 218 N-Br 243 Br-Br 193 S-H 339 -C 298 H-H 436 S-F327 I-Br180 H-F 569 S-C 251 1-I H-CI 431 S-Br 218 H-Br 368 S-S 266 H-1 297 131 Si-H 293 Si-Si 226 Si-C 801 Si-O 368 Multiple Bonds C-C 611 CC 837 C=N 615 498 N-N 418 N N 946 C=() 799 CEO 07 S O 523 S=S 418 Te bd eegies for the diatomie molecules ca be measured directly; the other num- bers are average bond energies

Explanation / Answer

CH4 + O2 = CO2+ H2O

balance

CH4 + 2O2 = CO2+ 2H2O

-HRxn = Hborken - Hformed

-HRxn = (CO2 + 2H2O) - (CH4 + 2O2)

-HRxn = (2*(799)+ 4*463) - (4*414+ 2*498)

-HRxn = 798

HRxn = -798 kJ/mol

real value is approx - 800 kJ/mol, so it is near enoug

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