5) From the relative charges on the ions, we predict that the ion-ion attractions in CaF2 are greater than in NaF. Confirm this prediction by calculating the lattice energies of (a) NaF and (b) CaF2, given the following information: AHsub Na(s) = +109 kJ/mol and AHsub Ca(s) = +154 kJ/mol AHBE F2(g) +154 kJ/mol and AHIE1 Ca(g) = +590 kJ/mol AHEA F(g) -328 kJ/mol and AHIE2 Cal(g) = +1145 kJ/mol AHIE1 Na(g) = +495 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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