Exergonic reactions have a negative $\Delta G$: the system loses free energy. Spontaneous reactions are also defined in the same way, as far as I know. Does this mean the two are synonymous?

There are some questions (e.g. here) asking the same question for exothermic reactions, but not all exergonic reactions are exothermic.

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    $\begingroup$ That depends on conditions under which your process is taking place. If process happening under constant temperature and pressure, then negative $\Delta$G < 0 $\equiv$ spontaneous. Elif happening under constant entropy and pressure, $\Delta$H < 0 $\equiv$ spontaneous $\endgroup$
    – TheLearner
    Feb 9, 2021 at 0:07


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