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

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

mole fraction of $B$ in the outlet liquid is $0\mathrm{.}00001.\frac{L}{V}=12\mathrm{.}0,$ 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 $100\mathrm{.}0C$ equilibrium in terms

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