Chemistry / Chem 2118 · Atom · ~20 seconds
Standard Free Energy of Formation ΔG°f
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The standard free energy of formation, ΔG°f, is a compound's free energy change forming from its elements in their standard states, with every element's own ΔG°f exactly zero.
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ΔG°f for liquid water is a negative tabulated value describing its formation from H2(g) and O2(g).
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ΔG°f mirrors ΔH°f's zero-for-elements convention, but it is a distinct quantity carrying entropy's contribution too.