a$)$ For each of the following compounds $($TCE$,$ benzene, $2,4,5-$trichlorophenol$),$ estimate the Henry's

Law constant $(H,$ in $m^3-$atm$/$mole$)$ from its water solubility $($S$)$ and vapor pressure $($VP$)$ using the

temperature$-$dependent values listed below.

b$)$ Convert the calculated $H$ values to a dimensionless constant $(H^{\text{'}}).$ Assume a temperature of $20C.$

c$)$ Air stripping $-$ the process of dropping water down a packed tower with a countercurrent of air

blown in from the bottom $-$ is the most commonly used design for the removal of volatile organics

from groundwater after it is pumped to the surface $($called pump$-$and$-$treat remediation$).$ Based on the

concepts that you have learned in class, which of the three compounds listed above would you expect

to be effectively and economically treated using air stripping? Provide a rationale for your answer.

TCE:

Benzene:

$VP=58mmHg$;$S=1310m\frac{g}{L}$

$2,4,6-$trichlorophenol

$VP=76mmHg=S=1700m\frac{g}{L}$

$VP=2\mathrm{.}25{10}^{-5}$atm;$S=800m\frac{g}{L}$