Experimental data for the binary system ethanol (1) and butyl-methyl-ether (2) report that at T =
50 °C and P = 53.75 kPa the system is at an equilibrium between a liquid and a vapor phase. The
composition of ethanol in the liquid phase is x1 = 0.6225 and the composition of ethanol in the
vapor phase is y1 = 0.403. The same report provides the experimental values of the two chemicals
saturation pressures at 50 °C as:

Psat (ethanol) = 29.34 kPa
Psat (butyl-methyl-ether) = 50.69 kPa

v. (5p total) Find the dew point pressure (3p) and the composition of the first droplet (2p) of
this system at 50oC for an ethanol – butyl-methyl-ether mixture having 75 mol% ethanol.
vi. (8p total) Compute the vapor (2p) and liquid composition (2p) and liquid fraction L/F (3p)
for an overall composition of zethanol= 0.75, zbutyl-methyl-ether= 0.25 at 50 oC and P = 42 kPa.
vii. (8p total) Compute the vapor (2p) and liquid composition (2p) and the system pressure P
(3p) in kPa, for an overall composition of zethanol = 0.75, zbutyl-methyl-ether= 0.25 at 50 oC and
a L/F ratio of 0.8.