Given the following thermodynamic data, calculate the lattice energy of LiCl: ΔH°f[LiCl(s)] = -409 kJ/mol ΔH°sublimation [Li] = 161 kJ/mol Bond energy [Cl-Cl] = 243 kJ/mol IE1 (Li) = 520 kJ/mol EA1 (Cl) = -349 kJ/mol -1682 kJ/mol -984 kJ/mol -1560 kJ/mol -862 kJ/mol -1213 kJ/mol
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.
Given the following
ΔH°f[LiCl(s)] = -409 kJ/mol
ΔH°sublimation [Li] = 161 kJ/mol
Bond energy [Cl-Cl] = 243 kJ/mol
IE1 (Li) = 520 kJ/mol
EA1 (Cl) = -349 kJ/mol
- -1682 kJ/mol
- -984 kJ/mol
- -1560 kJ/mol
- -862 kJ/mol
- -1213 kJ/mol
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