Please do #b and please include a x-y pentane diagram.

26.3-2. Comparison of Differential and Flash Distillation. A mixture of 100kg mol that contains 60mol% n-pentane (A) and 40mol%n heptane (B) is vaporized at 101.32kPa pressure under differential conditions until 40kg mol are distilled. Use equilibrium data from Example 26.3-2. a. What is the average composition of the total vapor distilled and the composition of the remaining liquid? b. If this same vaporization is done in an equilibrium or flash distillation and 40kg mol are distilled, what is the composition of the vapor distilled and of the remaining liquid