Problem 1. Air with 1.6 %mol SO₂ (you can assume very dilute conditions) is scrubbed with solute-free water in a packed column of 1.5 m² cross-sectional area and 3.5 m in height. The total gas flow rate is 0.062 kmol/s, the total liquid flow rate is 2.2 kmol/s, and the outlet air has an SO₂ mol fraction of 0.004. The equilibrium can be described by y*=40x. a) What is the minimum water flow rate required? b) How does the overall number of gas transfer units (NOG) compare to the number of theoretical stages required? c) What is the overall height of a gas transfer unit (HOG).

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