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.
Consider the following reaction where Kc = 77.5 at 600 K:
CO(g) + Cl2(g) COCl2(g)
A reaction mixture was found to contain 2.37×10-2 moles of CO(g), 4.44×10-2 moles of Cl2(g) and 0.105 moles of COCl2(g), in a 1.00 Liter container.
Indicate True (T) or False (F) for each of the following:
___ TF 1. In order to reach equilibrium COCl2(g) must be produced.
___TF 2. In order to reach equilibrium Kc must decrease.
___TF 3. In order to reach equilibrium CO must be consumed.
___TF 4. Qc is greater than Kc.
___TF 5. The reaction is at equilibrium. No further reaction will occur.
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