Tetrachloromethane at a concentration of 15 mg/L (Cow)is to be reduced to 15 g/L(Cw) by an air stripping tower. What is the required height (L) and the concentration of tetrachloromethane at the exit air (Ca) for the following conditions: (25p)Air to water flow ratio (Qa/Qw) = 40:1 Qw = 25 m3/h Cylindrical tower diameter (d) = 1 m Henrys constant (H) for tetrachloromethane = 0.98 Lw/LaWater diffusion coefficient for chloroform (Dw) = 3x10-9 m2/s Water kinematic viscosity (w) = 8.9x10-7 m2/s