Calculate the standard entropy, ASn, of the reaction at 25.0 °C using the table of thermodynamic properties. C,H,(g) + H,O() C,H,OH(1) ASin = J-K-l-mol rxn Calculate the standard Gibbs free energy of the reaction, AGn- The standard enthalpy of the reaction, AHan is -44.2 kJ-mol-. AG = kJ-mol- Determine in which direction the reaction is spontaneous as written at 25.0 "C and standard pressure. forward neither reverse O both Question Source: MRG-General Chemistry Publisher: University Science Books
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.
From any reaction we can calculate the entropy change and Gibbs free energy change of the reaction .
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