Consider a spill under a gas station that has primarily ethylbenzene in it. The ethylbenzene has partitioned in the water and its concentration in the water phase is 0.86 mg/L.

a. Find the concentration of ethylbenzene in the gas phase of the soil pores at equilibrium. Follow the two steps given below: i. Henrys constant for ethylbenzene is 1.4x10-3 mol/(m3Pa). Convert to M/atm. You will need to find the conversion factor between Pa and atm (which are both measures of pressure) ii. Once you have Henrys constant in M/atm, apply Henrys law to find the concentration in the gas phase for the given concentration in the water phase.

b. Find the Maximum Contaminant Limit of ethylbenzene in water. Report your source. Does the water sample exceed the MCL and by how much (in %)?