Example 2.8: The same gas as in the previous example is compressed polytropically (n = 1.25) from 1 atm and 70 °F to 5 atm. Find point and path functions. V₁ = 386.6 ft³/lbmol

Solution

$ Final temperature, T₂ (Equation 2.28):

C Internal energy change, ΔU (Equation 2.22):

$ Specific heat at polytropic compression C_n (Equation 2.29)

C Heat added to the system, Q (Equation 2.30)

C Work done by the system, W (Equation 2.21)

C Enthalpy change, ΔH (Equation 2.24)

$ Entropy change, ΔS (Equation 2.31)

C Final volume, V₂ (Equation 2.32)