A cyclohexane$-$air mixture $(0\mathrm{.}01$ mole fraction cyclohexane$)$ is scrubbed with an oil an oil

$($molecular weight $250,$ specific gravity of $0\mathrm{.}875,$ mole fraction cyclohexane of $0\mathrm{.}003)$ in a packed column at $30$C and $2$ atm. The gas entering flow rate is $0\mathrm{.}1713$ m$3/$s$.$ and the oil rate is $2\mathrm{.}52$ x $10-3$ kmol$/$s$.$ Ninety percent of the cyclohexane is to be removed. The cross sectional area of the tower is $0\mathrm{.}186$ m$2$ and the mass transfer coefficient are given as

kmol$/$m$3.$s

kmol$/$m$3.$s

Find the height of packing required.