A packed stripping column is used to remove a contaminant $($A$)$ from water. The equilibrium relationship is $y_A=0\mathrm{.}1x_A.$ At a point in the middle of the column, the liquid phase mole fraction is $0\mathrm{.}05$ and the gas phase mole fraction is $0\mathrm{.}001.$ The overall mass transfer coefficient based in the liquid phase is mole fraction