Which text book solve; An air ammonia stream containing 4% Ammonia by volume is scrubbed by 2N H2SO4 in a counter current wetted wall column of 15mm ID and 750mm long. The outlet gas rate is 0.20kmol/hr the operating is concentrated by 20C and 1atm. Under these conditions 90% of the incoming ammonia is absorbed if the change in acid concentration is negligible, calculate the value of the mass transfer coefficient Kg