Calculate Inlet/Outlet Gas Relative Humidities

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Air is compressed to 10 atmospheres, cooled to 25 degrees C and passed through a bed of molecular sieve that has an initial moisture content of 8 lb water/100 lb sieve. the saturation vapor pressure of water at 25C is 24 mmHg. Assume M.W of air is 30 and the height of a transfer unit is 3 inches. How can i calculate the inlet and outlet gas relative humidities?
 
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You should use Fick's first laws and set up some mass balance for the mass transfer. Take the following source for some caluclated examples: http://www.composite-agency.com" . Regards, Hedenqvist
 
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