Self-Test

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

- Melting of a solid
- Evaporation of a liquid
- Sublimation
- Freezing

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

- 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?

- 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?

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

5. Calculate S° for 3O_{2}(g) --> 2O_{3}(g)
when S° for O_{2} is 205 J/K/mol and O_{3} is 239 J/K/mol.