The compound oxygen difluoride is quite reactive, giving oxygen and HF when treated with water: OF₂(g) + H₂O(g) + O₂(g) + 2HF(g) AEºrxn = -318 kJ Using bond energies, calculate the bond dissociation energy of the O-F bond in OF2. Average Bond Energies (kJ/mol) Single Bonds H-H H-F H-CI 427 H-Br 363 H-1 295 432 565 C-H C-C C-N C-0 358 485 339 276 240 259 C-F C-CI C-Br C-1 C-S 413 347 305 *C=O(in CO₂) = 799 N-H N-N N-F N-CI N-Br N-O O-H 0-0 O-F O-CI 0-1 F-F F-CI F-Br CI-CI Cl-Br Br-Br O-F bond dissociation energy = 391 160 272 200 243 201 467 146 190 203 234 154 253 237 239 218 193 kJ/mol H I-cl 1-Br S-H S-F S-CI S-Br S-S Si-Si Si-H Si-C Si-O 149 208 175 347 327 253 218 266 340 393 360 452 Multiple Bonds C=C C=C 0 0 C=0* C=O N=O N=N N=N C=N CIN 614 839 495 745 1072 607 418 941 891 615
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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