What is the value of gibbs free energy at equilibrium?
Answers
Gibbs free energy is a measure of how much "potential" a reaction has left to do a net "something." So if the free energy is zero, then the reaction is at equilibrium, an no more work can be done. It may be easier to see this using an alternative form of the the Gibbs free energy, such as Δ G = − T Δ S .
GIBBS FREE ENERGY;
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The Gibbs free energy is an invented thermodynamic function, G = H - TS, designed in part to serve the purpose of defining equilibrium under the most practical conditions used for studying chemical reactions, a closed system at constant T and P.
It is called a work-content function, and it can be shown that delta G is the maximal amount of work that a chemical reaction can produce during a reversible process.
The best example is an electrochemical cell connected to a motor, which is connected to a pulley system lifting a weight. If we have a redox reaction
A + B <=> C + D
the cell can do work so long as current flows in one direction or the other, but that can only happen if the reaction is not at equilibrium. When no work can be done, delta G is zero, which is also the state of equilibrium.
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