Ahydrocarbon feed consist of a mixture of propane [c3h8] (20 mol%), isobutene [c4h10] (30 mol%), isopentane [c5h12] (20 mol %) and n-pentane [c5h12] (30 mol%) is fractioned at a rate of 100 kg/h into a distillate that contains all the propane and 78% of the isopentane in eng142 concepts of chemical engineering the feed. the mole fraction of isobutane in the distillate is 0.378. the bottom stream contains all the n-pentane feed to the unit. a) develop a block diagram of the process. (5 marks) b) calculate the flow rate at the bottom stream. (30 marks) c) on a table show the material balance of the unit.