Problem $1.20$ points

Use the Pxy graph $($below$)$ for the system $1,4-$dioxane $(1)/$ methanol $(2)$ at $308\mathrm{.}5K$ to answer the following questions $($draw on the graph and attach it to your solutions$)$:

a$)$ What is the saturation pressure of methanol at $308\mathrm{.}5K?2$ pts

b$)$ What is the phase of a mixture that contains $40\%$ dioxane at $308\mathrm{.}5K$ and $0\mathrm{.}14$ bar? Mark the phases on the graph $($V$,$ L and V$/$L$)$ and mark the point for this mixture $($point $"$b$")3$ pts

c$)$ Determine the bubble and dew pressure of a mixture that contains $40\%$ dioxane at $308\mathrm{.}5K.$ Mark the bubble and dew lines on the graph. $5$ pts

d$)$ At what pressure should the mixture with $40\%$ dioxane be flashed at $308\mathrm{.}5K$ to obtain vapor that is $70\%$ rich in methanol? $5$ pts

e$)$ What is the composition of the liquid and the amounts of the liquid and vapor phases after flash from the previous question? $5$ pts