Write the thermochemical equation for the following reactions that occur at constant pressure: (a) combustion of hexane (C6H12) to carbon dioxide gas and water releases 3923.9 kJ of heat (b) decomposition of mercuric oxide (HgO) to mercury and oxygen gas requires 87.1 kJ of heat (c) one mole of ammonium nitrate dissolves in water to produce aqueous ammonium ions and nitrate ions, accompanied by the absorption of 28.1 kJ of heat
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.
Write the thermochemical equation for the following reactions that occur at constant pressure:
(a) combustion of hexane (C6H12) to carbon dioxide gas and water releases
3923.9 kJ of heat
(b) decomposition of mercuric oxide (HgO) to mercury and oxygen gas requires
87.1 kJ of heat
(c) one mole of ammonium nitrate dissolves in water to produce aqueous
ammonium ions and nitrate ions, accompanied by the absorption of 28.1
kJ of heat
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