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A 200 mL sample of drinking water contains 3.5 10-6 grams of mercury. Determine the concentration of Hg in parts per billion (ppb). Is

A 200 mL sample of drinking water contains 3.5 × 10-6 grams of mercury. Determine the concentration of Hg in parts per billion (ppb). Is this water safe to drink according to EPA standards? Show work.

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