Using bond energies, what is the heat of reaction for this chemical change? (units of kJ/mol are assumed) 413 348 293 358 C-F 485 cicl 328 C-Br 276 C-1 240 C-S 259 Average Bond Enthalpies (kJ/mol) Single Bonds C-H C-c C-N C-O Si-H 323 Si-Si 226 Si-C 301 Si-O 368 Multiple Bonds Br-Br C=C 614 C=C 839 C-N 615 C=N 891 C-O 799 C=0 1072 H-C=C-H 391 N-H NIN 163 N-O 201 N-F 272 N-CI 200 N-Bri 243 H-H 436 H-F 567 H-Cl 431 H-Bri 366 H-I 299 N=N 418 N=N 941 O-H 463 010 146 0-F 190 O-CI 203 0-1 234 S-H 339 S-F 327 S-Cl 253 S-Br 218 S-S 266 0₂ SIO S-S 495 523 418 Br Br F-F H 155 CI-F 253 CI-CI 242 Br-F 237 Br-Cl 218 Br-Br 193 A I-CI 208 I-Br 175 1-1 151
Thermochemistry
Thermochemistry can be considered as a branch of thermodynamics that deals with the connections between warmth, work, and various types of energy, formed because of different synthetic and actual cycles. Thermochemistry describes the energy changes that occur as a result of reactions or chemical changes in a substance.
Exergonic Reaction
The term exergonic is derived from the Greek word in which ‘ergon’ means work and exergonic means ‘work outside’. Exergonic reactions releases work energy. Exergonic reactions are different from exothermic reactions, the one that releases only heat energy during the course of the reaction. So, exothermic reaction is one type of exergonic reaction. Exergonic reaction releases work energy in different forms like heat, light or sound. For example, a glow stick releases light making that an exergonic reaction and not an exothermic reaction since no heat is released. Even endothermic reactions at very high temperature are exergonic.
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