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4. An organic vapour is to be recovered from a gas by condensation. The partial pressure of this vapour in the gas mixture entering the condenser is 1900 mm Hg, and its partial pressure in the outlet gas stream is 1000 mm Hg. The total pressure in the system is 2000 mm Hg, and the temperature at the gas outlet is 200 C. Calculate the volume (m) of gas leaving the condenser per 100 kmol of organic condensate. Answer: 164 m3