Concept explainers
Interpretation:
The Gibbs free energy and required change in enthalpy for a reaction system are to be calculated with given Keq value.
Concept introduction:
Gibbs Free Energy can be defined as
ΔG° = ΔH° - TΔS° …… (1)
Here, ΔG° is the Gibbs free energy, ΔH° is the enthalpy change, and ΔS° is the entropy change at constant temperature T and constant pressure.
When the change in entropy is negligible or zero, the equation changes to the expression: ΔH° = ΔG° + TΔS°Goes to ZeroΔH° = ΔG°
Second law of thermodynamics tells about the spontaneity of a reaction and Gibbs free energy will tell in which direction the reaction is spontaneous.
It can be expressed mathematically as
ΔG°=−RTlnKeq ……. (2)
Here, ΔG° is the Gibbs free energy, R is the universal gas constant, T is the temperature, and Keq is the equilibrium constant.
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