Consider the following Lewis structure and table of bond energies. What is the total sum of the bond energies in this molecule? H :O: H-H 436 H-F 569 H-CI 432 H-Br 366 H-I -H Table of Average Bond Energies (kJ/mole) N-H 390 NIN 240 N-F 270 NCI 200 N-Br 240 N O 200 298 C-H 410 C-C 350 C-N 300 C10 350 C-F 450 C-Cl 330 C-Br 270 CII 240 01H O -0 0 F o-cl 011 460 142 180 200 220 F-F 157 F-CI 251 F-Br 234 Cl-Cl Cl-Br Br Br |-| 1-Br I-CI I-F 243 219 194 153 179 208 280 C=C C=0 C=N C=S 010 N=N N=O C=C C=O CEN NEN 611 745 615 477 498 418 607 835 1077 891 941
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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