3. We plan to remove benzene from a mixture of air-benzene using an absorption countercurrent tower and pure oil as absorbent. The gas feed of 6.57x10-3kmol/s contains 2.5 mol% benzene and leaves the tower with 0.1 mol% benzene. The tower operates at 1 atm and constant temperature. The equilibrium line for benzene is Y = 0.109 X (mole of solute/mole of solvent). a. Estimate the minimum required flow rate of oil, and the corresponding composition at the exit. b. In the Y versus X plot, draw the equilibrium line, the operating line, and the (Ls/Gs)min line as well. [a. 18 b. 7]