A laboratory steam stripper with 11 real stages is used to remove \(1000.0 \mathrm{ppm}\) (wt) nitrobenzene from an aqueous feed stream that enters at \(97.0^{\circ} \mathrm{C}\). Flow rate of liquid feed stream is \(\mathrm{L}_{\text {in }}=\mathrm{F}=1726 \mathrm{~g} / \mathrm{h}\). Entering steam rate is measured as \(\mathrm{S}=99.0 \mathrm{~g} / \mathrm{h}\). Leaving vapor rate is measured as \(\mathrm{V}_{\text {out }}=61.8 \mathrm{~g} / \mathrm{h}\). Column pressure is \(1.0 \mathrm{~atm}\). Treated water is measured at \(28.1 \mathrm{ppm}\) nitrobenzene. At \(100.0^{\circ} \mathrm{C}\) equilibrium in terms of nitrobenzene mole fraction is \(\mathrm{y}=28.0 \mathrm{x}\). Molecular weights are 123.11 and 18.016 for nitrobenzene and water, respectively. What is the overall efficiency of column? Note: A significant amount of steam condenses in this system to heat the liquid feed to its boiling point and to replace significant heat losses. An approximate solution can be obtained by assuming all this condensation occurs on the top stage, ignoring condensation of nitrobenzene, and adjusting liquid flow rate in the column.