Problem: 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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The standard molar enthalpy of formation of NO2(g) is 33.2 kJ/mol at 25C and that of N2O4(g) is 9.16 kJ/mol. At 25C 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 25C.

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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