To save energy, stack gas from a furnace is used to dry rice. The flow sheet and known data are shown in Figure P12.11. What is the amount of recycle gas (in Ib mol) per 100 lb of P if the concentration of water in the gas stream entering the dryer is 5.20%? Stack gas S (Ib moi) 4.73% H20 Rocycle R Wet gas (Ib mol) 9.31% H0 Dryer Rice feed F (ib) Rice feed P (Ib) 75% Rice 25% Water 95% Rice 5% Water

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