6- Draw Born - Haber Cycle and Calculate the lattice enthalpy for lithium fluoride, given the following information: • Enthalpy of sublimation for solid lithium = 151 kJ/mol • First ionization energy for lithium = 519 kJ/mol • F-F bond dissociation energy = 164 kJ/mol • Enthalpy of formation for F(g) = 82 kJ/mol • Electron affinity for fluorine = -348 kJ/mol Enthalpy of formation for solid lithium fluoride = -617 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.
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