We will now see why studying the free energy of a system is
useful in determining its behaviour. The free energy change, ΔG,
of a chemical reaction is the difference in free energy between
the products of the reaction and the reactants. If the free
energy of the products is less than the free energy of the
reactants there will be a driving force for the reaction to
occur. For the reaction the free energy change, if the standard
states . We see that the free energy change of a reaction is
determined by the relative quantities of reactants and products.
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