1 what is the fugacity coefficient for pure superheated

Question

1. What is the fugacity coefficient for pure, superheated steam at 300^oC and 1.2 MPa?

2. Benzene has a boiling point equal to 80.1^oC at atmospheric pressure (1.013 bar). The molar volume of benzene is 9.004 * 10 -5 m3/gmol. What is the fugacity of benzene at 80.1^oC and 100 bar?

3. Benzene (boiling point = 80.1^oC) and toluene (boiling point = 111^oC) form a nearly ideal liquid solution. What is the Gibbs energy of mixing for liquid containing 25 mol % benzene and 75 mol % toluene at 80.1^oC