Consider a throttling process (insulated valve) that changes the pressure of methane gas at the following conditions: - (1) Ti=250F and Pi=0.1MPa to Pf=0.01MPa - (2) Ti=200F and Pi=20MPa to Pf=3MPa - (3) Ti=25F and Pi=70MPa to Pf=50MPa (a) For each condition, on a methane P - H diagram (find one), locate the final temperature (b) If you (erroneously) assumed methane was always an ideal gas what would be the final T at each condition? (c) Use the methane P-H diagram to estimate (PT)H at each initial condition. (d) What is (PT)H for an ideal gas? (e) On a copy of the pressure-enthalpy diagram for methane sketch the region where you think it is acceptable to model methane as being an ideal gas