Self-Test

1.  Which of the following involve an increase in the entropy of the system?

1. Melting of a solid
2. Evaporation of a liquid
3. Sublimation
4. Freezing

2.  Given the values of H and S, will it be spontaneous at a constant T and P?

1. H = +25 kJ, S = +5 J/K, T = 300 K

3.  Given the values of H and S, will it be spontaneous at a constant T and P?

1. H = +25 kJ, S = +100 J/K, T = 300 K

4.  Given the values of H and S, which of the following changes will be spontaneous at constant T and P?

1. H = -10 kJ, S = +5 J/K, T = 298 K
2. H = -10 kJ, S= -40 J/K, T = 200 K

5.  Calculate S� for 3O₂(g) --> 2O₃(g) when S� for O₂ is 205 J/K/mol and O₃ is 239 J/K/mol.