V. How would you carry out a scale-up/down for a material balance problem? 6. A hydrocarbon feed consisting of a mixture of 4 components with the mass fractions: propane (20%), isobutene (30%), isopentane (20%), and n-pentane is fractionated at a rate of 100kg/h into a distillate that contains all the propane and 78% of the isopentane in the feed. The mass fraction of isobutene in the distillate is 0.378. The bottom stream contains all the n-pentane fed to the unit. Find the NDF and determine the flow rate of the bottom stream