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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Answer the following questions.
CO(g) +2 H2(g) CH3OH(1) AH° =-128.1 kJ
S°
AH
(kJ mol-')
-110.5
-238.6
AG
(kJ mol-1)
(J mol- K-)
CO(g)
CH3OH(1)
-137.3
-166.2
+197.9
+126.8
The data in the table above were determined at 25°C.
(a) Calculate AG° for the reaction above at 25°C.
(b) Calculate Keg for the reaction above at 25°C.
(c) Calculate AS for the reaction above at 25°C.
(d) In the table above, there are no data for H2. What are the values of AHƐ, AGƐ, and of the absolute
entropy, S°, for H2 at 25°C?"
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