The standard molar free energies of formation of NO2(g) and N2O4(g) at 25C are 51.840 and...
The standard molar free energies of formation of NO2(g) and N2O4(g) at 25C are 51.840 and 98.280kJ/mol, respectively. What is the Value of Kp for the following equilibrium at 25C?
Homework Answers
2NO2<---> N2O4(g)
free energy change , deltaG= standard free energy of N2O4-2*standard free energy of NO2 = 98.280-2*51.840 = -5.4 Kj
1 and 2 are stoichiometric coefficients of N2O4 and NO2 respectively.
deltaG=-RT ln K
lnK= equilibrium constant = -delatG/RT= 5.4*1000/ (8.314*298)=2.18
K= 8.84
for the reverse reaction N2O4<----> 2NO2 , KP= 1/8.84= 0.1132
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