20. In the PFD given below components A (CH3OH), B (C2H5OH) and C (C2H4OH) are separated in a distillation column. F (kg A/h) 2000 (kg/h) 0.03 kg B/kg 0.97 kg C/kg 1200 kg/h 0.70 kg A/kg Y4 (kg B/kg) 24 (kg C/kg) 5300 kg/h xz (kg A/kg) Yz (kg B/kg) F (kg/h) 0.60 kg B/kg 0.40 kg C/kg (a) (b) (C) (d) (e) How many molecular species are there? How many unknowns are there? How many equations relating the unknown variables are there? How many degrees of freedom are there? If Stream 2 is specified to have a mass fraction of 0.49 kg CH3OH/kg of mixture you can now prepare a balanced flow sheet. Why? Solve for all of the unknowns. Convert the mass fractions of stream 4 to mole fractions. E (f) (9)