please solve it clearly

Problem 3. ( 33.3 points) 1000 kmol/h of air containing 100 ppm of chloroform at 250C and 2 atm is to be processed. We plan to absorb the chloroform with pure water at 250C. Operation is at L/V = 1.4 (L/V) min. if we want an outlet air stream containing 10.0 ppm chloroform how many equilibrium stages are required use McCabe Thiele method for absorption. The equilibrium relation is y = 105.6x