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These two terms refer to different thermodynamic state functions. An endergonic reaction is one that has a positive change in Gibb's free energy (non-spontaneous). An endothermic reaction is one that has a positive change in enthalpy (requires heat).
“Gonic” refers to change in Gibbs free energy and “thermic” refers to change in enthalpy. When delta G is less that 0 it is spontaneous and exergonic and when it is greater than 0 it is not spontaneous and endergonic
I agree with the above answers. Endergonic refers to the consumption of Gibb's free energy (delta G > 0) by the system. Endothermic refers to the consumption of enthalpy (heat under constant pressure conditions) by the system (delta H > 0).
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