3. (50 Points) 250 kg moth of n-heptane (A) and n-octane (3) mixture containing 54 mol% n- heptane is fractionated at 101.32 kPa pressure in a columnn equipped with total condenser and partial reboiler to produce distillates containing 96 mol % n-noptane and bottoms containing 96 mol% n-octane. The foed enters the tower partially vaporized such that one third is liquid and two thirds are vapor. Using the below (x, y) equilibrium curve, calculate (15) The molar flow of distillates and bottoms. (20 points) The theoretical number of stages required for an operating reflux ratio of 3 and identify the feel tray. (10 Points) The ratio of the operating reflux ratio to the minimum reflux ratio. (5 Points) The column height if the tray efficiency is 0.78 and the tray spacing is 45 cm