By means of a plate column, acetone is absorbed from its mixture with air in a nonvolatile absorption oil. the entering gas has a flow rate of 100 moles/minute and contains 30 mole percent acetone. the entering oil contains 1.5 mole percent acetone and has a liquid flow rate, la, of 350 moles/minute. of the acetone in the air, 90 percent is to be absorbed. the equilibrium relationship is ye = 1.9 xe. plot the operating line and determine the number of ideal stages.