$\Delta G^\circ=\Delta H^\circ-T\Delta S^\circ=-74900-300(-80)=-50900$ J/mol. Since ΔG°=−RT lnK, lnK=50900/(8.314×300)=20.407. Exponentiation gives K≈7.3×10⁸, D. The entropy term reduces the driving force relative to ΔH° alone.
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