Air containing 1.6 vol% SO2 is scrubbed at 1 atm with pure water in a packed column of 1.5-m cross-sectional area and 3.5-m height, packed with No. 2 plastic Super Intalox saddles. The total gas flow rate is 0.062 kmol/s, the liquid flow rate is 2.2 kmol/s, and the outlet-gas SO2 concentration is y = 0.004. At the column temperature, the equilibrium relationship is y = 40x. (a) What is L/Lmin? (b) Calculate NOG and compare your answer to that for the number of theoretical stages required. (c) Determine HOG and the HETP from the operating data. (d) Calculate Ka from the data based on a partial-pressure driving force, as in Item 2