1-Butanol and chlorobenzene form a low-temperature azeotropic system. The mole fraction of 1-butanol in the liquid (X) and vapor (Y) phase at 1.00 atm is given below for a number of boiling temperatures [H. Artigas et al, J. Chem. Eng. Data 1997, 42, 132].

T / K 396.57 393.94 391.60 390.15 389.03 388.66 388.57
X 0.1065 0.1700 0.2646 0.3687 0.5017 0.6091 0.7171
Y 0.2859 0.3691 0.4505 0.5138 0.5840 0.6409 0.7070

Pure chlorobenzene boils at 404.86 K.

a) Construct the chlorobenzene-rich portion of the phase diagram from the data.

b) Estimate the temperature at which a solution whose fraction of 1-butanol is 0.300.

c) State the compositions and relative proportions of the two phases present after a solution initially at thjis mole fraction (0.300) is heated to 394.94.