The US Environmental Protection Agency (EPA) places limits...

The US Environmental Protection Agency (EPA) places limits on the quantities of toxic substances that may be discharged into the sewer system. Limits have been established for a variety of substances, including hexavalent chromium, which is limited to 0.50 $\mathrm{mg} / \mathrm{L}$ . If an industry is discharging hexavalent chromium as potassium dichromate $\left(\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}\right),$ what is the maximum permissible molarity of that substance?

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Key Concepts

Environmental Regulatory Limits

Environmental regulatory limits, such as those set by agencies like the EPA, impose maximum allowable concentrations for toxic substances in discharges. These limits are expressed in standard units like mg/L, and converting them to molarity can be necessary for compliance assessments and chemical process calculations.

Molar Mass Calculation

Calculating the molar mass of a compound from its chemical formula is a key step in converting mass-based concentrations to molar concentrations. This involves summing the atomic masses of all atoms in the molecule to determine how many grams per mole the substance weighs.

Unit Conversion from Mass to Moles

This concept involves converting a concentration given in mass per volume (such as mg/L) to molarity by using the molar mass of the substance. It requires careful unit conversion to ensure that the mass units and volume units correctly translate into moles per liter.

Molarity

Molarity is a concentration unit defined as the number of moles of a solute per liter of solution. Understanding molarity is essential in chemistry for quantitative analysis, reactions, and conversions between mass and moles.

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