Use the following data to calculate the lattice energy of cesium oxide. You must write all thermochemical equations for the steps of the cycle. Enthalpy of formation of CSO = -233 kJ/mol Enthalpy of sublimation of Cs = +78 kJ/mol First ionization energy of Cs = + 375 kJ/mol Enthalpy of dissociation of O₂ (g) = + 494 kJ/mol First electron affinity of O=-141 kJ/mol Second electron affinity of O= + 845 kJ/mol -750 kJ/mol -2090 kJ/mol O +1690 kJ/mol -1045 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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