Q.

The standard enthalpy of the decomposition of N2O4 to NO2 is 58.0kJ and standard entropy of this reaction is 176.7 J/K. Therefore the standard free energy changes for this reaction at _______________(in KJ) (rounding off to nearest integer)

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answer is 5.

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Detailed Solution

Give that standard enthalpy of decompositions  (ΔH)=58.04kJ
Standard entropy  (ΔS)=176.7kJ/K=176.7×103kJ/K
And temperature  (T)=25°C+273=298K
Change in free energy  
(ΔG)=ΔHTΔS=58.04298×(176.7×103)=5.39kJ

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