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Calculation Based on Purifying Groundwater

Perchloroethylene is an industrial solvent that can be used for metal degreasing. If 2000 L of perchloroethylene were accidentally leaked into the environment and entered the groundwater, how many tonnes of iron would be needed to purify the groundwater using an underground permeable wall? (perchloroethylene density = 1.623 g/mL)

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Please see attachment as well so that this can be seen more clearly.

Perchloroethylene, C2Cl4, has molecular mass of 166 ...