How Many Milligrams Are in a Millimole?

By Staff WriterLast Updated Apr 5, 2020 9:59:27 PM ET

The number of milligrams per millimole of a given substance is equivalent to that substance's molar mass. A millimole is one thousandth of a mole, and moles are a measure of the amount of substance, not mass. Therefore, the number of milligrams in a millimole varies depending on the substance being measured.