Question

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

Answer 1

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"`.