Enter your answer in the provided box. The lattice energy of MgO is 3890 kJ/mol. The first and the second ionization energies (IE₁ and IE ₂) of Mg are 738 kJ/mol and 1450.6 kJ/mol, respectively. The first ionization energy of O is 1314 kJ/mol. The first electron affinity EA ₁) of O is +141 kJ/mol. Using these data, as well as data from a table of thermodynamic data at 1 atm and 25°C, determine the second electron affinity for oxygen, EA 2 (O). 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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