The Superfund site at Mowbray Engineering Co$.$ in Greenville, AL

is contaminated with polychlorinated biphenyls $($PCBs$),$ known

carcinogens. To evaluate their transport on the site, you carry out

a laboratory experiment where $1$ mole of PCB is added to a $1000$ cm$3$

container containing water, air, and soil in equal volumes. Given

the pertinent partition coefficients $($KH and Ksw$),$ what is the

concentration of PCB in the water? Your answer should be an

expression for the concentration of PCB in water in terms of known

parameters only $($variables$,$ not numeric values$).$