When calculating the concentration of a solution in units of parts per million,the "parts" must be expressed in units of grams.

Name: When calculating the concentration of a solution in units of parts per million,the "parts" must be expressed in units of grams.
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Parts per million (ppm) is a unit of concentration that can be expressed in terms of mass (grams), volume (liters), or even mixed units, depending on the context of the substances being measured.

When Calculating the Concentration of a Solution in Units of Parts