$4.)$ Your client requires removal of $90\%$ of COz $($A$)$ in a gas stream. Absorption in water containing NaOH $($B$)$ will be used to achieve the removal. Chemical A and B react in the liguid as follows:COz $($g $-+1)+$ NaOH $(1)-+$ NaHCO, $($I$)-$ TA $=$ KCACgNa$$H has a negligible vapour pressure, hence does not go into the gas phase. What volume of packed column will you recommend for this operation?$(17\mathrm{.}5$ marks$)$DA $=$ De $=3\mathrm{.}6\backslash$times $10-6$m$?/$hFy $=90,000$mol$/$h$,$ Pr $=10\backslash$deg Pa$,$k $=$ a $=100$m$?/$mCu $=55,556$ mol$/$m$\text{'},$ HA $=105$ Pa$.$m $/$mol$,$ fi$-0\mathrm{.}08$Pain $=1000$ Pa$,$ PAou $=100$ Pa$,$ F$=900,000$ mol$/$h$,$Gain $=55\mathrm{.}56$ mol$/$m$\backslash$deg $,$ Kara $=72$hr $3,$ KAga $=0\mathrm{.}36$ mol$/($hr$.$m$.$Pa$)$