3) C₂H₂(g) + 2 H₂(g) → C₂H6(g) (bon coinlatino Information about the substances involved in the reaction represented above is summarized in the following tables. (a) (b) Substance C₂H₂(g) C₂H6(g) Write the equation for the heat of formation of C₂H6(g) and C₂H6(g). d AH°f (kJ/mol) 226.7 -84.7 Use the above information to determine the enthalpy of reaction for the equation given.
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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