Relative formula mass

The sum of the relative atomic masses of every atom in a substance's chemical formula; its symbol is $M_r$.

The sum of the relative atomic masses of all the atoms shown in a chemical formula. Relative formula mass, $M_r$, has no unit.

The sum of the relative atomic masses of all the atoms represented in a chemical formula. It has no unit.

The sum of the relative atomic masses of every atom represented in a chemical formula.

The sum of the relative atomic masses of all the atoms in a substance's formula; its value, Mᵣ, has no unit.

The sum of the relative atomic masses of all the atoms shown in a substance's formula; it has no unit.

The sum of the relative atomic masses of all the atoms shown in a chemical formula.