Absorption of $C{O}_2$ from air. The exit gas from an alcohol fermenter consists of an air$-C{O}_2$ mixture containing $10$mol$\%C{O}_2$ that is to be absorbed in a $5\mathrm{.}0-N$ solution of ethanolamine, containing $0\mathrm{.}04$ mole $C{O}_2$ per mole of amine solution. If the column operates isothermally at $25C,$ if the exit liquid contains $78\mathrm{.}4\%$ of the $C{O}_2$ in the feed gas to the absorber$,$ and if the absorption is carried out in a six$-$theoretical$-$plate column, use the equilibrium data below to calculate: $($a$)$ exit gas composition, $($b$)$ moles of amine solution required per mole of feed gas. Use McCabe$-$Thiele method only.

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