Amixture of iso-propanol (more volatile, i-proh) and n-propanol has an approximately constant relative volatility of 1.8. 100 kmol/h of a saturated liquid feed containing 40 mol% i-proh is available. the distillate is to contain 90% i-proh, and the bottoms product 10% i-proh. a. if the reflux ratio is 4, how many ideal stages are required for this separation? do stage-by-stage calculations by hand or the mccabe-thiele method. b. what is the minimum reflux ratio possible? c. what is the minimum number of stages needed for this separation? d. compare the results for parts (a) to (c) to what is obtained using the fug method.