4.32 (a) Calculate the enthalpy of formation of the hypothetical compound KF, assuming a CaF, structure. Use the Born-Mayer equation to obtain the lattice enthalpy and estimate the radius of K2- by extrapolation of trends in Table 1.4 and Resource section 1. Ionization enthalpies and electron gain enthalpies are given in Tables 1.5 and 1.6. (b) What factor prevents the formation of this compound despite the favourable lattice enthalpy?
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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Table 1.4 gave the ionic radii in pm. For k+ it was 138(6), 151(8),159(10) and for f- it was 128(2), 132(4), 133(6).
Table 1. 5 gave ionization energies in kj/mol. For k they were 419, 3051 and 4410. For f it was 1681,3375, and 6050.
Table 1.6 gave
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