A packed tower 4.0 m tall is used to absorb ethyl alcohol from an inlet gas by 90 kmol/h of pure water at 303 K and 101.3 kPa. The total gas flow rate is 100 kmol/h containing 2.0 mol% of alcohol and the exit concentration is 0.2 mol%. The equilibrium relation is y*=0.68x for this dilute stream. (a) Find NOG, HOG for this process. (b) If the cross-section area of the tower is 1.5 m2, how much is the overall gas side mass transfer coefficient, Kya? (c) If the packed height is increased to 4.2m, how much is the concentration of ethyl alcohol in the exit gas?