Calculate the lattice energy of sodium fluoride; NaF in kJ/mol from the following data: lonization energy of Na: + 496 kJ/mol Electron affinity of F: - 328 kJ/mol Energy to vaporize Na: + 108 kJ/mol F2 bond energy: + 160 kJ/mol The energy of reaction: Na(s) + F2(g)- -> NaF(s); AH xn = -575 kJ a) - 851 b) -931 c) - 1011 d) + 931
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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