A chemical plant produces an ammonia-rich waste gas that cannot be released as-is into the environment. One method to reduce the

ammonia concentration in the waste gas is to bubble the waste gas

through a liquid solvent. Components of the gas that are highly

soluble, like ammonia, will dissolve into the liquid phase. Water

is an appropriate liquid solvent for this process. The chemical

plant produces 115.0 m3/hr of waste gas (? = 0.0407 mol/L)

initially having a mole fraction of 0.120 NH3, and wishes to remove

90.0% of the initial amount of NH3. The maximum concentration of

ammonia in water at this temperature is 0.4000 mol NH3/ mol water.

Neglect the absorption of other waste gas components into the

water, and the evaporation of water into the waste gas stream.