$500$ kg$/$h of seawater containing $3\mathrm{.}50$ wt$\%$ salt passes through a series of $10$ evaporators.

Roughly equal quantities of water are vaporized in each of the $10$ units and then condensed and

combined to obtain a product stream of fresh water. The brine $($salt solution$)$ leaving each

evaporator is fed to the next evaporator. The brine leaving the tenth evaporator contains $7\mathrm{.}50$

wt$\%$ salt.

$($a$)$ Draw a flowchart of the process showing the first, fifth and tenth evaporators. Label all

the streams entering and leaving these three evaporators.

$($b$)$ Perform the degree$-$of$-$freedom analysis for the overall process and for the first five

evaporators together.

$($c$)$ Determine $($i$)$ the fractional yield of fresh water from the process $($kg H$2$O recovered$/$kg

H$2$O in the process feed$)$ and $($ii$)$ the weight percent of salt in the solution leaving the

fifth evaporato