A liquid stream contains $0\mathrm{.}02$ mol$\%$ of solute B in water at $100\mathrm{.}0$o C$.$ Solute B will be removed

from this liquid stream in a stripper using steam at $100\mathrm{.}0$ o C$.$ Entering steam is pure water. The

mole fraction of B in the outlet liquid is $0\mathrm{.}00001.$ L$/$V$=12\mathrm{.}0,$ where L and V are liquid and gas flow

rates through the column and are assumed constant. Find the outlet mole fraction of solute B in the

vapor stream and the number of stages using Kremser equation. At $100\mathrm{.}0$o C equilibrium in terms

of solute B mole fraction is y$=20$x$.$