Gibbs free energy and spontaneity

How the second law of thermodynamics helps us determine whether a process will be spontaneous, and using changes in Gibbs free energy to predict whether a reaction will be spontaneous in the forward or reverse direction (or whether it is at equilibrium!).

More rigorous Gibbs free energy / spontaneity relationship

More formal understanding of why a negative change in Gibbs Free Energy implies a spontaneous, irreversible reaction.

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# Gibbs free energy example

Determining if a reaction is spontaneous by calculating the change in Gibbs free energy. Also calculates the change in entropy using table of standard entropies. . Created by Sal Khan.