9. We are separating acetone and ethanol in a distillation column with a total condenser and a partial reboiler. The column has two feeds and operates at a pressure of 1.0atm. Feed 1 is a saturated liquid that is 60.0mol% acetone and has a feed rate of F1=200.0 kmol/h. The second feed is 40.0mol% acetone, has a feed rate of F2=300.0kmol/h, and is a two-phase mixture that is 20% vapor. Assume CMO is valid. Bottoms product is 10.0mol% acetone, and distillate product is 80.0mol% acetone. a. External reflux ratio L/D=2.0. Find the number of stages required, the optimum feed stage locations, and the boilup ratio V/B. b. Find the minimum external reflux ratio (L/D)min for part a. c. If feed 2 is changed to a superheated vapor that forces 1.0 mole of liquid to vaporize at the feed stage to cool every 5.0 moles of feed 2 to a saturated vapor, find (L/D)min. Hint: The answer is not the same as in part b