Summary

You can use the molar mass of a substance to convert a concentration in units of molarity to a concentration in units of mass per volume. By multiplying molarity by the molar mass and applying a unit conversion, concentrations can be expressed in milligrams per liter.

This unit of concentration is commonly used in public health, environmental science, and regulatory reports, making the conversion of concentrations necessary when comparing laboratory results to safety guidelines.

Key Steps

  1. Determine the molar mass: Find the atomic weight from the periodic table and use it as the molar mass (g/mol).
  2. Calculate concentration in g/L: Multiply molarity (mol/L) by molar mass (g/mol).
  3. Convert to mg/L: Multiply the result by 1000 to convert grams to milligrams.

Final Formula

concentration (mg/L) = molarity (mol/L) × molar mass (g/mol) × 1000 (mg/g)

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