2. The compression factor data for a real gas is shown in Fig. 2 (next page) in terms of Z vs. pressure (in units of psi). Answer the following questions. Note that psia in Fig. 2 is same as psi in our lecture note.

(a) (5 pt) Determine the second virial coefficients B in units of atm-1 at T = 10, 25, 50, 75, and 100 oF.

(c) (5 pt) Here we fit the above 5 second virial coefficients with the following equation: BRT = + /T for this real gas, where and are constants, and R is the gas constant. First you plot BRT vs. 1/T, and then estimate the value from your plot. Briefly explain your estimation. Note that your units should be atm, L, K and/or mole in this question.

(d) (2 pt) What is the units of in terms of atm, L, K and/or mole?

Fig. 2 1.1 - IF 650 1.0 600 4000 900- N 0.9 2502 2009 0.8 +592 Compressibility factor, z 100 75 0.7 50 25 06 so 05 for 0.65 sp g net gas Pc=670 psia, To=378R OPTIT 0.4 500 1000 1500 3500 4000 4500 5000 2000 2500 3000 Pressure, psia Fig. 2 1.1 - IF 650 1.0 600 4000 900- N 0.9 2502 2009 0.8 +592 Compressibility factor, z 100 75 0.7 50 25 06 so 05 for 0.65 sp g net gas Pc=670 psia, To=378R OPTIT 0.4 500 1000 1500 3500 4000 4500 5000 2000 2500 3000 Pressure, psia