What is Gibbs free energy? How is Gibbs free energy calculated?

1 Answer
anor277
Jun 26, 2017

The #"Gibbs Free Energy"# is the single unequivocal criterion for the #"spontaneity of chemical change....."#

Explanation:

See this old answer and links.......

#DeltaG^@=DeltaH^@ -TDeltaS^@#

And thus it includes an #"enthalpy term"#, and an #"entropy term......"#

The Gibbs free energy is the single, unequivocal criterion for the spontaneity of chemical change. Negative values of #DeltaG# denote a #"spontaneous reaction"#. If #DeltaG=0#, then the reaction is at equilibrium. And if #DeltaG>0# then the reaction is non-spontaneous....

#DeltaG# may also be related to the equilibrium constant, #K_"eq"# by the equation:

#DeltaG^@ =-RTlnK_"eq"#.

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