Consider an ionic compound, MX3, composed of generic metal M and generic gaseous halogen X. • The enthalpy of formation of MX3 is AH; = -885 kJ/mol. • The enthalpy of sublimation of M is AH sub = 121 kJ/mol. • The first, second, and third ionization energies of M are IE₁ = 649 kJ/mol, IE₂ = 1635 kJ/mol, and IE3 = 2689 kJ/mol. • The electron affinity of X is AHEA = −319 kJ/mol. (Refer to the hint). • The bond energy of X₂ is BE = 191 kJ/mol. Determine the lattice energy of MX3. kJ/mol AH lattice =
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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