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Thermodynamics: RE-NEET 2026

Easy· Gibbs Energy Change and Equilibrium· +4 / −1
A protein undergoes reversible thermal denaturation from its initial state N\mathbf{N} to denatured state D\mathbf{D} according to N⇌D\mathbf{N} \rightleftharpoons \mathbf{D}. At 60∘60^\circC, the concentrations of both N\mathbf{N} and D\mathbf{D} are equal at equilibrium, and the standard enthalpy change of denaturation is 666 kJ mol−1666\ \mathrm{kJ\,mol^{-1}}. The standard entropy change (ΔS∘\Delta S^\circ in kJ K−1 mol−1\mathrm{kJ\,K^{-1}\,mol^{-1}}) of the protein upon denaturation at 60∘60^\circC is closest to
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