Question: 6 5 . A single - effect evaporator takes 2 0 % NaOH at its boiling point and concentrates it to 4 0 % NaOH.

65. A single-effect evaporator takes 20% NaOH at its boiling point and concentrates it to 40% NaOH. The vapor space is maintained at 0.253 atm abs. How much heat is required to remove 1 lb of water?

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