Gibbs Free Energy is a state function combining enthalpy and entropy in the form of G = H – TS. J. Willard Gibbs developed this equation, which provides a convenient way to use the change in enthalpy and change in entropy to predict whether a given reaction occurring at constant pressure and constant temperature will be spontaneous. The derivation of this equation can be seen below.
19.5 Free Energy (G)
We can also consider the various situations for the relative signs of ΔH and ΔS to predict how ΔG will change with temperature. We can use the chart generated in the video below to investigate the effect of temperature on the spontaneity of a chemical reaction.
19.5 Predicting the Sign of Delta G
Mastering Chemistry Tutorial Question:
•Interactive Activity – Temperature Dependance of Entropy
Mastering Chemistry Tutorial Question:
•Gibbs Free Energy: Temperature Dependance
19.6 Free Energy Under Non-standard Conditions
19.6 Thermochemistry of the Haber Process
Mastering Chemistry Tutorial Question:
•Free Energy and the Reaction Quotient
Mastering Chemistry Tutorial Question:
•Gibbs Free Energy and Equilibrium
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