The toxicity of DDT (C14H9Cl5) led to a ban on its use in the United States in 1972. Determinations of DDT concentrations in groundwater samples from Pennsylvania between 1969 and 1971 yielded the following results:

tion Mass of DDT 0. 0290 mg 0. 0340 mg 0. 600 mg ample Size 48 mL Orchard Residential Residential after a storm 1. 79 L 9. 0 mL

Express these concentrations in millimoles per liter

1st attempt

Part 1 (1 point)

Orchard ________mmol/L

Part 2 (1 point)

Residential ______mmolVL

Part 3 (1 point)

Residential after a storm ________mmol/L