[15 pts] Plot P/P* = xewx/RT x1ewx/RT versus x for RT/w = 0.60, 0.50, 0.45, 0.40, and 0.35. Note that some of the curves have regions where the slope is negative. The following problem has you show that this behavior occurs when RT/w < 0.50. These regions are similar to the loops of the van der Waals equation when T < Te, and in this case correspond to regions in which the two liquids are not miscible. The critical value RT/w: = 0.50 corresponds to a solution critical temperature.