ASAP

$(40$ pts total$)$ During the $1990$ s$,$ the chemical MTBE was added to gasoline sold in some regions

of the U$.$S$.$ Unfortunately, this chemical began to show up in groundwater due to leaky

underground storage tanks.

As an environmental engineer, you are studying various processes for "cleaning up$"$

contaminated groundwater that contains MTBE.

One possible process is air stripping, in which the contaminated water is fed as an input stream to

the top of a stripping column. Pure dry air is a second input stream, at the bottom of the column.

Two output streams leave the stripping column. A liquid stream containing nearly pure water

with essentially zero MTBE and no dissolved air leaves at the bottom. A gas stream containing

air, water vapor, and MTBE vapor leaves at the top of the column.

Composition data for the problem:

Contaminated water: $98\mathrm{.}3$ mass $\%$ water, $1\mathrm{.}7$ mass $\%$ MTBE

Output gas stream: $1\mathrm{.}1$ mass $\%$ water vapor, $50\mathrm{.}6$ mass $\%$ MTBE, $48\mathrm{.}3$ mass $\%$ air

Both the dry air input and the water output are pure.

Basis: Flow rate of pure dry air into the column is exactly $100k\frac{g}{h}.$

$($a$)(10)$ Draw and label a flowchart for the process

$($b$)(10)$ Use a degrees of freedom analysis to show that the problem is solvable.

$($c$)(15)$ Determine the ratio of the mass flow rate of the contaminated water stream to the mass flow rate of the dry air stream.

$($d$)(5)$ Determine the average molecular weight of the output gas stream. Make sure to use a method or equation which is correct when mass fractions or mass percents are used.

$($Water$=18,$ Air$=29,$ MTBE$=88)$