Self-Test

hippo_li.gif (2057 bytes)

 

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 wpe5.jpg (740 bytes)H and wpe5.jpg (740 bytes)S, will it be spontaneous at a constant T and P?

  1. wpe5.jpg (740 bytes)H = +25 kJ, wpe5.jpg (740 bytes)S = +5 J/K, T = 300 K

3.  Given the values of wpe5.jpg (740 bytes)H and wpe5.jpg (740 bytes)S, will it be spontaneous at a constant T and P?

  1. wpe5.jpg (740 bytes)H = +25 kJ, wpe5.jpg (740 bytes)S = +100 J/K, T = 300 K

4.  Given the values of wpe5.jpg (740 bytes)H and wpe5.jpg (740 bytes)S, which of the following changes will be spontaneous at constant T and P?

  1. wpe5.jpg (740 bytes)H = -10 kJ, wpe5.jpg (740 bytes)S = +5 J/K, T = 298 K
  2. wpe5.jpg (740 bytes)H = -10 kJ, wpe5.jpg (740 bytes)S= -40 J/K, T = 200 K

5.  Calculate wpe5.jpg (740 bytes)S for 3O2(g) --> 2O3(g) when S for O2 is 205 J/K/mol and O3 is 239 J/K/mol.