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The ammonsa$-$air mixture enters a packed column to absorb ammonia in water. Feed enters at $1\mathrm{.}5k\frac{g}{s}$ in which ammonia has a mol fraction of $0\mathrm{.}15.$ At the outlet, $0\mathrm{.}0015$ mol fraction of ammonia is left in the gas stream. Water of $2k\frac{g}{s}$ is used in the column. Design the packed column for the following data: Molecular weight of $N{H}_3$ and air is $17$ and $29\frac{g}{g}$mol, respectively. Berl saddle packing of $25mm$ is used. The pressure drop and column temperature are $42mm{H}_2\frac{O}{m}$ packing and $25C,$ respectively. Properties at operating temperature: ${}_v=15k\frac{g}{m^3},{}_l=1000k\frac{g}{m^3},{}_l={10}^{-3}N\frac{s}{m^2},$

${}_v=1\mathrm{.}5{10}^{-5}N\frac{s}{m^2},D_1=1\mathrm{.}9{10}^{-9}\frac{m^2}{s},D_v=2{10}^{-5}\frac{m^2}{s}.f_t=f_2=f_3=1?$