For each of the fluid state changes below, perform the following calculations using the Peng-Robinson equation: 

(a) Prepare a table and summarize the molar volume, enthalpy, and entropy for the initial and final states; 

(b) calculate ΔH and ΔS for the process; and 

(c) compare with ΔH and ΔS for the fluid modeled as an ideal gas. Specify your reference states.

(a) Propane vapor at 1 bar and 60°C is compressed to a state of 125 bar and 250°C.

(b) Methane vapor at -40°C and 0.1013 MPa is compressed to a state of 10°C and 7 MPa.