Verified Solution • 2025–26 Session moderate

QJEEM25Ch063d: JEE Main 2025 Chemistry - Class 11 JEEM25Ch063d Solution: The standard enthalpy and standard entropy of decomposition of…

The standard enthalpy and standard entropy of decomposition of N2O4\mathrm{N}_2 \mathrm{O}_4 to NO2\mathrm{NO}_2 are 55.0 kJ mol−155.0 \mathrm{~kJ} \mathrm{~mol}^{-1} and 175.0 J/K/mol175.0 \mathrm{~J} / \mathrm{K} / \mathrm{mol} respectively. The standard free energy change for this reaction at 25∘C25^{\circ} \mathrm{C} in J mol−1\mathrm{mol}^{-1} is ________ (Nearest integer)

Step-by-Step Verified Solution

ΔHrxn∘=55 kJ/mol,T=298 K\Delta \mathrm{H}_{\mathrm{rxn}}^{\circ}=55 \mathrm{~kJ} / \mathrm{mol}, \quad \mathrm{T}=298 \mathrm{~K}

ΔSrxno=175 J/molΔGrxno=ΔHrxno−TΔ Srxno⇒ΔGrxno=55000 J/mol−298×175 J/mol⇒ΔGrxno=55000−52150⇒ΔGrxno=2850 J/mol

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