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3. The temperature during steam distillation of nitrobenzene (Cs H&NO) contaminated by small amount of tar, is 99° C. The saturated vapor pressure of nitrobenzene at 99°C is from Antoine's law 22mm. Steam distillation is being done at 760 mm. What is the vapor pressure of steam? Calculate the mol ratio of the distillate and steam, and how many lbs of steam are needed per lb of nitrobenzene?

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