Test 3 Spring 07

Test 3 Spring 07 - ChE 2114 Third Test April 13, 2007 1....

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ChE 2114 Third Test April 13, 2007 1. (20 points) Wet sugar containing 20.0 mass % water is fed to a continuous drier and completely dried sugar leaves the drier at a rate of 800 kg/hr. Dry air enters the drier at 85.0 o C and 1 atm and wet air leaves the drier at 72.0 o C and 1 atm with a relative humidity of 40.0%. (a) (15 points) What is the volumetric flow rate of dry air entering the dryer, in units of cubic meters per hour? (b) (5 points) If the wet air leaving the drier is compressed isothermally, what total pressure is necessary for dew to form?
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2. (15 points) At 1.00 atmosphere, the bubble point of a liquid mixture of benzene and toluene is 95.0 o C. What is the mol fraction of benzene in the vapor that is in equilibrium with the liquid at the bubble point? Antoine Constants: Benzene Toluene A = 6.89272 A = 6.95805 B = 1203.531 B = 1346.773 C = 219.888 C = 219.963
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3. (15 points) A gas mixture which is 20.0 mol % CO 2 and 80.0% air has a pressure of 2.00 atmospheres and a temperature of 20.0
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Test 3 Spring 07 - ChE 2114 Third Test April 13, 2007 1....

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