A polyatomic gas is characterized by the following phenomenological coefficients:

and

If the gas goes through an isothermic expansion from an initial state 1 atm (pressure) to a final state of 4L (volume) and 0.5 atm pressure,

a) Find the state equation for the gas.

b) Find the initial volume of the gas.

c) Represent the process described above in the thermodynamics phase space.