ΔG Under Nonstandard Conditions
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State
Away from standard conditions, free energy change is ΔG = ΔG° + RT ln Q, adjusting the standard value by the reaction quotient Q.
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A reaction with ΔG° slightly positive can still have ΔG negative, and proceed forward, if Q is small enough.
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ΔG° describes standard conditions only; ΔG describes the mixture as it stands, and need not share ΔG°'s sign.