A vapor mixture consists of $10\%$ mole of methanol and $90\%$ mole of air fed to a single condenser unit

at $180C$ and $5$atm. About $80\%$ of the methanol of the feed stream is liquefied in this steady$-$state

process, while the remaining exits as a vapor product. The liquid stream exits at $0C$ and $1$atm while

the vapor stream exits at $100C$ and $1$atm.

a$)$ Draw the process flowchart and determine the exit molar flow rates for both stream products

by choosing an appropriate basis.

$(5$ marks$)$