Ethylbenzene is an aromatic hydrocarbon that is commonly found in contaminated sediments and waters. Its molecular weight is 106, log Kow is 3.15, vapor pressure is 1.3 kPa at 25?C, aqueous solubility is 0.0016 mol/L at 25?C, enthalpy of vaporization is 2.1 kJ/mol, and enthalpy of solution is 46.2 kJ/mol.
(a) Find its vapor pressure at 30?C.
(b) Find its aqueous solubility at 30?C.
(c) From the above data find its Henry's constant at 30?C and express in kPa/L/mol.
(d) If the air above a lagoon has ethylbenzene at a partial pressure of 0.1 kPa at 30?C in equilibrium with the water, what is the aqueous concentration at that temperature?
(e) If the water in the lagoon is overlying the sediment in equilibrium with it at 30?C, and if the sediment organic carbon fraction is 0.02, what is the concentration of ethylbenzene in the sediment (answer in mg/kg)?