Afeed of 22.2 mole% ethanol and the balance water, at 1 atm and an enthalpy of 4,860 btu/lbmole, is to be separated by distillation in a plate column with open steam (at an enthalpy of 1,200 btu/1b) and a partial condenser. the bottom product is to contain 3.8 mole% ethanol and the distillate product (saturated vapour) 78 mole% ethanol. 10.0 lb of steam are used per lbmole of feed. (a) what is the condenser duty per mole of distillate product? (b) what are the co-ordinates of the δ point associated with the bottom of the column? (c) how many ideal stages are required? (d) how many actual plates are required, if the partial condenser is equivalent to one ideal plate and the rest of the tower has an overall efficiency of 75%?