An et al. investigated the liquid–liquid coexistence curve of N,Ndimethylacetamide and. Mole fractions of N,Ndimethylacetamide in the upper (x1) and lower (x2) phases of a two-phase region are given below as a function of temperature:
T/K
309.820
309.422
309.031
308.006
306.686
x1
0.473
0.400
0.371
0.326
0.293
x2
0.529
0.601
0.625
0.657
0.690
304.553
301.803
299.097
296.000
294.534
0.255
0.218
0.193
0.168
0.157
0.724
0.758
0.783
0.804
0.814
(a) Plot the phase diagram. (b) State the proportions and compositions of the two phases that form from mixing 0.750 mol of N,N-dimethylacetamide with 0.250 mol of heptane at 296.0 K. To what temperature must the mixture be heated to form a single-phase mixture?
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