Problem
The problem of oxygen solubility in water is important in water quality engineering. Reaeration of streams and lakes is important for maintaining an acceptable oxygen level for aquatic organisms to thrive.
(a) The solubility of oxygen in water at 1 bar pressure and 298 K is given as 1.13 × 10-3 molal. Calculate the free energy of solution of oxygen in water.
(b) It is known that atmospheric air has about 78% by volume of nitrogen and 21% by volume of oxygen. If the Henry's constants (KH) for oxygen and nitrogen are 2.9 × 107 and 5.7 × 107 Torr, respectively, at 293 K, calculate the mass of oxygen and nitrogen in 1 kg of pristine water at atmospheric pressure.
(c) If Raoult's law is obeyed by the solvent (water), what will be the partial pressure of water above the solution at 98 K. The vapor pressure of pure water is 23.756 Torr at 298 K.
The response should include a reference list. Double-space, using Times New Roman 12 pnt font, one-inch margins, and APA style of writing and citations.