Example 2.10: The same gas as in the previous example is cooled from 500 °F to 70 °F at constant pressure of 5 atm. Find point and path functions.

Solution:

$ Initial volume, V₁:

$ Final volume, V₂ (Equation 2.38):

$ Internal energy change, ΔU:

$ Work done by the system, W (Equation 2.39):

$ Heat added to the system, Q (Equation 2.36)

$ Entropy change, ΔS (Equation 2.37):