# Problem: A river is contaminated with 0.65 mg/L of dichloroethylene (C2H2Cl2). What is the concentration (in ng/L) of dichloroethylene at 21°C in the air breathed by a person swimming in the river (kH for C2H2Cl2 in water is 0.033 mol/L·atm)?

###### FREE Expert Solution

Recall that the solubility of a gas is given by Henry’s law:

$\overline{){{\mathbf{S}}}_{{\mathbf{gas}}}{\mathbf{=}}{{\mathbf{k}}}_{{\mathbf{H}}}{\mathbf{·}}{{\mathbf{P}}}_{{\mathbf{gas}}}}$

Molar mass of C2H2Cl= 96.94 g/mol

${\mathbf{S}}_{{\mathbf{C}}_{\mathbf{2}}{\mathbf{H}}_{\mathbf{2}}{\mathbf{Cl}}_{\mathbf{2}}}\mathbf{=}$6.705 x 10-6 mol/ L

96% (97 ratings)
###### Problem Details

A river is contaminated with 0.65 mg/L of dichloroethylene (C2H2Cl2). What is the concentration (in ng/L) of dichloroethylene at 21°C in the air breathed by a person swimming in the river (kH for C2H2Cl2 in water is 0.033 mol/L·atm)?