The average mass of an atom of the element compared to \(\dfrac{1}{12}\) of the mass of one carbon-12 (C-12) atom.
\(\,\\\dfrac{\text{Average mass of one atom}}{\dfrac{1}{12} \times \text{Mass of one C-12 atom}} \\ \,\\\)
The average mass of a molecule of the element compared to \(\dfrac{1}{12}\) of the mass of one carbon-12 atom.
\(\,\\\dfrac{\text{Average mass of one molecule}}{\dfrac{1}{12} \times \text{Mass of one C-12 atom}} \\ \,\\\)
The relative mass of an ionic substance is called the relative formula mass, RFM.
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