1- A mixture of water and ethyl alcohol containing continuously distilled in a plate fractionating column to give a product containing 0.77 mole fraction alcohol and a waste of 0.02

mole fraction alcohol. It is0.16 mole fraction alcohol is proposed to withdraw 25 per cent of the alcohol in the entering stream as a side stream containing 0.50 mole fraction Determine the number of theoretical plates required and the plate from which the side stream should be withdrawn if the feed is liquor at its boiling point and a reflux ratio of 2 is used.Data given:of alcohol.