$1.$A $100-$liter empty jar is spiked with $20$ mg of TCE $($C$2$HCl$3)$ under room temperature $($ambient$)$ condition. The jar was $0$then closed tightly. What is the concentration $($in atm.$)$ of TCE in the air at $25$ C$?($TCE: MW: $131\mathrm{.}4$ g$/$mol; TCE solubility in water $($Cs$)=1100$ mg$/$L; Pv $($pure liquid at $25$oC$)=10^-1\mathrm{.}01$ atm. KH $=10^1\mathrm{.}03$ L atm mol$-1$; KOW $=10^2\mathrm{.}42).2.$ in the last problem, if the jar was half filled with water and half filled with air, what were the

concentrations of TCE $($in mg$/$L$)$ in both air and water at $25$oC$?$