The standard molar enthalpy of formation of NO2(g) is 33.2 kJ/mol at 25◦C and that of N2O4(g) is 9.16 kJ/mol. At 25◦C their absolute entropies are 240.0 and 304.2 J/mol K, respectively. Use the data to calculate the standard Gibbs free energy change for the reaction
N2O4(g) → 2 NO2(g) at 25 ◦C.
1. 41.5 kJ/mol
2. 21.3 kJ/mol
3. 4.1 kJ/mol
4. 11.4 kJ/mol
5. 4.85 kJ/mol
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