A vapor mixture contains 50% pentane (1), 30% hexane (2) and 20%cyclohexane (3) (all in
mol-%), at T = 400 K, the pressure is gradually increased. What isthe dew point pressure and
the composition of the first liquid that is formed? Assume Rauolt’sLaw applied, solution is
ideal liquid and vapor is ideal gas.

Next, consider the same vapor mixture but at P = 5 bar, thetemperature is gradually
decreased. What is the dew point temperature and the composition ofthe first liquid that is
formed?