Q2: A tray tower is to be designed to absorb SO₂ from an air stream by using pure water a 20 °C. The entering gas contains 20 mol % SO, and that leaving 2 mol % at a total pressure of 101.3 kPa. The inert gas flow rate is 5.18 Kmol air/h-m², and the entering water flow rate is 333 Kmole water/h-m2. For the solute-free basis how many theoretical trays ? Assume that the tower operates at 20 °C. Equilibrium data for SO₂-water system at 20 °C and 101.3 kPa are given: 0001403 .000280 .000422 000564 000842 .001403 .001965 .00279 0775 0342 0513 00421 00763 01120 01855 .01385 0273 443 917 x 0 y0 00158 x 00420 .00698 y 121 212 .0206 682

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