$1.(4$ pt$)$ The solubility of $1,1,2-$trichloroethane in water is $4500$ mg$/$l; the vapor pressure is $30\mathrm{.}0$ mm Hg$.$ Compute Henry$$s constant in units of: a$)$ atm b$)$ dimensionless mole fraction c$)$ atm$$m$3/$mol d$)$ dimensionless concentration

$2.(3$ pt$)$ What is the air concentration of $1,1,2-$trichloroethane $($in mg$/$m$3)$ in equilibrium with a solution of $100$ ppm$.$ K$\text{'}$H $=4\mathrm{.}787$x$10-2.$

$4.(6$ pt$)$ The aqueous CO$2$ concentration, in equilibrium with $330$ ppm of CO$2$ in the air, is $10-5$ M$.$ Compute the dimensionless concentration Henry$$s constant. Currently, the level of CO$2$ is $409\mathrm{.}8$ ppm$.$ In water, dissolved CO$2$ becomes carbonic acid, H$2$CO$3.$ What does Henry's Law reveal about climate change? $($Do a brief internet search. Include $1$ government source.$)$

$5.(4$ pt$)10$ ml of water containing $10$ mg$/$l of compound A is placed in a vial with $30$ ml of toluene containing $5$ mg$/$l of A$.$ The partition coefficient is K $=20\mathrm{.}0.$ What will be the equilibrium concentration of A in water?