Q4. The purest acetic acid (CH3CO2H) is often called glacial acetic acid because it is purified by fractional freezing at its melting point of 16.6 °C. A flask containing several moles of acetic acid at 16.6 °C is lowered into an ice-water bath briefly. When it is removed, it is found that exactly 1 mol of acetic acid has frozen. Given: AfusH (CH3CO2H) = 11.45 kJ mol1 and AfusH (H2O) = 5.98 kJ mol1. (a) What is the change in entropy of the acetic acid? (b) What is the change in entropy of the water bath? (c) Now consider that the water bath and acetic acid are in the same system. How much is the entropy change for the combined system? Is the process reversible or irreversible? Why?
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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