please explain and show calculations, thank you!

2) The volume of 1.000mol of an ideal gas is changed from an initial value Vi=10.00L to a final value Vf=20.00L. by an isothermal irreversible expansion against a constant external pressure pes =1.000 atm. The process takes place at T=350.K. Find SpesSker and Suiv for the process. Note that you cannot assume pex=p. 3) It has been observed that the entropy of vaporization for a large number of liquids is approximately 85 . J/mol*K (Trouton's rule). a) Using the data below, find Swp for benzene (C6H6), carbon disulfide (CS2) and water (H2O). Can you suggest a reason why water does not follow Trouton's rule