2.

m

E,T,S,V, P, N

h

Consider the above system, which can exchange energy with the surrounding and

maintain an isothermal condition. All the variables shown there have their usual

meanings. The system does not exchange molecules. The movement of the mass

can perform external work.

By minimizing the total Helmholtz free energy of the system, find the condition or

conditions under which this system will be in equilibrium.