I need help with part b please.

A distillation column is to be used for separating n-butane and n-pentane where the feed (F) mole fractions are 0:15 and 0.85 , respectively. The molar flow rate of the feed stream is 100lbmol/hr and it is at P=10atm. The reflux ratio is 5 . a) It is desired to recover 88% of the butane in the top product, and the bottom product should contain 5mol% of butane. Perform mole balances to determine the molar flow rates of: i. The total top (D) and bottom (B) streams ii. Butane in the top and bottom streams b) If the feed is superheated by 40F, and the reflux is subcooled by 50F, calculate the condenser and reboiler heat duties. Make the following assumptions: All streams have the same thermal properties as n-pentane - The mean column temperature is 270F And determine the following: i. Given Tbp=242.9F, what is Tcondenser ? ii. Write an energy balance around the condenser to find the condenser duty in Btu/hr.(Hy@@270F=26,599Btu/lbmol,HD@192.9F=15,157Btu/lbmol) iii. Given Tdp=257.7F, what is Tfeed ? iv. Write an energy balance around the entire column to find the reboiler duty in Btu/hr (HB@ column temp =19,024Btu/lbmol,HF@superheatedvapT=27,469Btu/lbmol) (Hints: the distillate is a subcooled liquid, the bottoms product is a liquid at the column temperature and the feed is a vapor at the superheated temperature) A distillation column is to be used for separating n-butane and n-pentane where the feed (F) mole fractions are 0:15 and 0.85 , respectively. The molar flow rate of the feed stream is 100lbmol/hr and it is at P=10atm. The reflux ratio is 5 . a) It is desired to recover 88% of the butane in the top product, and the bottom product should contain 5mol% of butane. Perform mole balances to determine the molar flow rates of: i. The total top (D) and bottom (B) streams ii. Butane in the top and bottom streams b) If the feed is superheated by 40F, and the reflux is subcooled by 50F, calculate the condenser and reboiler heat duties. Make the following assumptions: All streams have the same thermal properties as n-pentane - The mean column temperature is 270F And determine the following: i. Given Tbp=242.9F, what is Tcondenser ? ii. Write an energy balance around the condenser to find the condenser duty in Btu/hr.(Hy@@270F=26,599Btu/lbmol,HD@192.9F=15,157Btu/lbmol) iii. Given Tdp=257.7F, what is Tfeed ? iv. Write an energy balance around the entire column to find the reboiler duty in Btu/hr (HB@ column temp =19,024Btu/lbmol,HF@superheatedvapT=27,469Btu/lbmol) (Hints: the distillate is a subcooled liquid, the bottoms product is a liquid at the column temperature and the feed is a vapor at the superheated temperature)