Consider the following reaction: Br2(g) + 3 F2(g) → 2 BrF3(g) Δ H r x n= ‒836 kJ/mol Bond Bond Energy (kJ/mol) Br–Br 193 F–F 155 Using the above bond dissociation energies, calculate the energy, in kJ/mol, of a Br–F bond. 168 kJ/mol 29.7 kJ/mol 498 kJ 59.3 kJ/mol 249 kJ
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.
Consider the following reaction: Br2(g) + 3 F2(g) → 2 BrF3(g)
Δ H r x n= ‒836 kJ/mol
Bond Bond Energy (kJ/mol)
Br–Br 193
F–F 155
Using the above
168 kJ/mol
29.7 kJ/mol
498 kJ
59.3 kJ/mol
249 kJ
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