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ExcelProblems - ChBi201 Excel Problems Due date Problem 1...

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ChBi201 Excel Problems Due date: Dec 18, 2008 Problem 1. The ideal gas law can represent the pressure-volume-temperature (PVT) relationship of gases only at low (near atmospheric) pressures. For higher pressures more complex equations of state should be used. The calculation of the molar volume and the compressibility factor using complex equations of state typically requires a numerical solution when the pressure and temperature are specified. The van der Waals equation of state is given by (a) Calculate the molar volume and compressibility factor for gaseous ammonia at a pressure P = 56 atm and a temperature T = 450 K using the van der Waals equation of state. (b) Repeat the calculations for the following reduced pressures: P r = 1, 2, 4, 10, and 20. (c) How does the compressibility factor vary as a function of P r .?
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Problem 2. Xylene, styrene, toluene and benzene are to be separated with the array of distillation columns that is shown below where F, D, B, D1, B1, D2 and B2 are the molar flow rates in mol/min.
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(a) Calculate the molar flow rates of streams D 1 , D 2 , B 1 and B 2 .
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