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.
Methanogens are organisms that produce methane according to the following reaction.
4 H2 (g) + CO2 (g) ---> CH4 (g) + 2 H2O (l) Kc=1.1x106 at 300 K
The reaction is very exothermic.
Based on the above information answer the following questions (e.g. increase, decrease or unchanged)
What would happen to the PCO2 if the temperature was increased?
What would happen to the PCO2 if the volume was decreased?
What would happen to the PCO2 if additional liquid water was introduced?
What would happen to the PCO2 if a catalyst was added?
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