$9$: A liquid mixture of diethyl ketone $(1)$ and $n-$hexane $(2)$ is fed into a flash distiller

operating at $328K$ and $\frac{0\mathrm{.}4}{b}ar.$ The feed rate is $2\mathrm{.}15mo\frac{l}{s}$ and the feed is $50\%($by mol$)$ of the $n-$

hexane.

What is the composition and amount of the resulting equilibrium phases?

If you take the exiting liquid phase from the flash distiller and send it into a second flash

distiller operating at $328K$ and $\frac{0\mathrm{.}3}{b}ar,$ what is the composition and amount of the

resulting equilibrium phases? What percentage of the diethyl ketone in the initial feed

entering the first flash distiller ends up in the liquid exiting the second flash distiller?

Which assumption that you made in solving this problem would you characterize as least

valid and why?