In a membrane separation experiment, you are investigating the separation of

N2 and O2 using a polysulfone (PSF) membrane column. The compressed air is fed into

the column at 70 psi and at room temperature 20C. The previous group working on

this experiment assumed the ideal gas law and directly used the partial pressure in their

analysis. But you and your group members have doubts about this assumption. As the

group leader, you decide to check this assumption before moving forward with the

analysis. You may assume 21 mol% O2 (1) and 79 mol% N2 (2) in the compressed air.

1. The molar volume of the compressed air at the inlet condition given in the problem using van der Waals equation of state.

2. the fugacity and the fugacity coefficient of oxygen at the inlet.

3. Is the ideal gas assumption appropriate at the inlet based on your calculation?