The U.S. requires automobile fuels to contain a renewable component. The fermentation of glucose from corn produces ethanol, which is added to gasoline to fulfill this requirement: C6H12O6(s) 2 C₂H₂OH() + 2 CO₂(g) Calculate AH, AS and AG for the reaction at 25°C. Is the spontaneity of this reaction dependent on temperature? ΔΗ rxn 45° rxn AGⓇ rxn || kJ J/K kJ The reaction is: O spontaneous at all temperatures O O nonspontaneous at all temperatures spontaneous only at high temperatures spontaneous only at low temperatures spontaneous only in the reverse direction
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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