Consider the reaction of SiO2 with N2 to form Si3N4 and O2 at 25°C & 1 atm. The standard heats of formation of the solids are AH°SiO2 = -911 kJ/mol & AH°Si3N4 = -745 kJ/mol. The standard heat of formation for the reaction is... O +1988 kJ/mol O2 O Impossible to determine without information on heat capacities. O -167 kJ/mol O2 O Impossible to determine without information on enthalpy of the gases. O +166 kJ/mol O2
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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