for a binary mixture of n-butane and n-hexane with butane mole fraction xb=0.7 at T= 450 K and P= 500Kpa, answer the following questions:
(a) considering the pure components separately, determine whether you are possibly dealing with a two-phase misture or not.
(b) assuming there is no change in volume upon mixing the pure components at the temperature and pressure of interest, calculate the fugacity of each component.