The dimensionless Henry constant for trichloroethene (TCE) at 25°C is 0.4. A sealed glass vial is prepared that has an air volume of 4 mL overlying an aqueous volume of 36 mL. TCE is added to the aqueous phase so that initially it has an aqueous phase concentration of 100 ppb. After the system equilibrates, what will be the concentration (in units of pg/L) of TCE in the aqueous phase?