Liquid air is fed to the top of a perforated-tray reboiled stripper operated at substantially atmospheric pressure. Sixty percent of the oxygen in the feed is to be drawn off in the bottoms vapor product from the still. This product is to contain 0.2 mol% nitrogen. Based on the assumptions and data given below, calculate:

(a) The mole percent of nitrogen in the vapor leaving the top plate.

(b) The moles of vapor generated in the still per 100 mol of feed.

(c) The number of theoretical platesrequired.

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Temperature, Mole-Percent N2 Mole-Percent N2 in Vapor in Liquid K 77.35 77.98 78.73 100.00 100.00 90.00 97.17 79.00 93.62