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There is no direct relationship between entropy and enthalpy. Enthalpy (H) is the amount of energy released or absorbed during a chemical reaction while entropy (S), defines the degree of randomness or disorder in a system. However, the free energy (G) regroups both terms as G= H-TS, where at a constant temperature, the change on free energy is defined as ∆G= ∆H-∆TS. Therefore, the free energy expression provides a relationship between enthalpy and entropy. Thus, for a system at equilibrium, ∆G=0 and then we find that ∆S=∆H/T.
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