Thermodynamics II:

The following are sample non multiple choice questions taken from recent exams: 
These particular questions cover:

      • Qualitative Ideas:
      • The Gibbs-Helmholtz Equation: DG=DH -TDS
      • DH0, DS0, DG0: Chemical reactions and Phase Changes
      • Thermodynamic problem solving
1DS0rxn for the combustion of ethane, a component of natural gas, is 46.4 (J/mol K). Calculate the absolute entropy for ethane gas.
C2H6(g) + 7/2 O2(g) ® 2 CO2(g) + 3 H2O(g)

(Use the appendix at the back of your book for any thermodynamic values you may need.)

Question 2 concerns the following N2O4/ NO2 equilibrium system: 
N2O4(g) « 2 NO2(g)     DH° = 57.2 kJ/mol
2The equlibrium constant for this reaction is 5.9 x 10–3 at 298 K. DGo for this reaction is ________ kJ/mol .