4. A distillation column is separating acetone from ethanol at a pressure of 1atm. We are interested in the enriching (top) section of the column. The distillate composition is 95mol% acetone (most volatile component). Reflux is returned to the column as a saturated liquid. CMO is assumed to be valid. For the reflux ratio R=L/D=3, find the liquid and vapor compositions leaving the fourth stage below the total condenser. Hint: Since we are using a total condenser, the first equilibrium stage in your calculation will be the first stage below the total condenser