If the S is very positive, an endothermic reaction (H > 0) could occur spontaneously. Entropy is said to be the reaction's driver in this instance. When temperatures are higher, these reactions frequently happen spontaneously.
If entropy rises by an amount more significant than the enthalpy change, an endothermic reaction may occur spontaneously. When the value of the endothermic reaction exceeds the value of the exothermic reaction (which typically occurs at very high temperatures), the endothermic reaction becomes endothermic, and the value becomes negative.
When the changes in entropy and enthalpy result in a negative Gibbs free energy, an endothermic reaction may occur spontaneously. If the rise in entropy exceeds the change in enthalpy, an endothermic reaction may occur spontaneously.
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