Q2 (18 marks) A distillation column with a total condenser, a total reboiler and four stages is separating 45 mole% methanol, 55 mole % water mixture. The feed, which is 30 mole % liquid and 70 mole % vapor, is fed to the third stage below the condenser at a rate of 50 kg moles/hr. Reflux is saturated liquid and material leaving the total reboiler is a saturated vapor. Constant molal overflow can be assumed. The external reflux ratio is 0.7. Distillate composition is 0.7. (a) 16 marks Find the resulting bottoms concentration