4.21 - Stirling Engine
4.30 - Household refrigerator
4.33 - Throttling nitrogen
5.1 - All the potentials of argon gas
5.4 - Voltage for electrolysis of water
5.8 - Thermodynamic identities for G
5.12 - Maxwell relations
5.13 - Thermal expansion must be zero at T = 0
5.23 - Grand potential

Problem 5.9 was removed