Pesticide concentrations in the portion of the rhine river that flows between germany and france averaged 0.55 mg/l of hexachlorobenzene (c6cl6), 0.06 mg/l of dieldrin (c12h8cl6o), and 1.02 mg/l of hexachlorocyclohexane (c6h6cl6) between 1969 and 1975. express these concentrations in millimoles per liter.

Explanation:

1) Concentration of hexachlorobenzene = 0.55 mg/L

1 mg = 0.001 g

Molar mass of hexachlorobenzene = 285 g/mol

Concentration of hexachlorobenzene in mol/L:

1 mole = 1000 milli moles

Concentration of hexachlorobenzene in millimoles per Liter:

2) Concentration of hexachlorobenzene = 0.06 mg/L

1 mg = 0.001 g

Molar mass of dieldrin = 381 g/mol

Concentration of dieldrin  in mol/L:

1 mole = 1000 milli moles

Concentration of dieldrin in millimoles per Liter:

3) Concentration of hexachlorocyclohexane = 1.02 mg/L

1 mg = 0.001 g

Molar mass of hexachlorocyclohexane = 291 g/mol

Concentration of hexachlorocyclohexane in mol/L:

1 mole = 1000 milli moles

Concentration of hexachlorocyclohexane in millimoles per Liter:

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aquifers are bounded above and below by impermeable rock. the driving force of groundwater movement in confined aquifers is pressure, rather than gravity.