A plant has 100 kmol of a liquid mixture of 20 mol% benzene and 80 mol% chlorobenzene, which is to be distilled at 1 atm to obtain bottoms of 0.1 mol% benzene. Assume a = 4.13. The plant has a column containing four theoretical plates, a total condenser, a reboiler, and a reflux drum to collect condensed overhead. A run is to be made at total reflux. While steady state is being approached, a finite amount of distillate is held in a reflux trap. When the steady state is reached, the bottoms contain 0.1 mol% benzene. What yield of bottoms can be obtained? The liquid holdup in the column is negligible compared to that in the reboiler and reflux drum.