Sodium oxide has a molecular mass of 62 amu, which is the sum of two sodium atoms and one oxygen atom.
The sum of the atomic masses of all atoms in a molecule is the molecule's molecular mass. As a result, if we know the molecular formula, which can be given and calculated, we can calculate the molecular mass. In chemistry, the formula weight is calculated by multiplying the atom weight (in atomic mass units) of each element in a chemical formula by the number of atoms in the formula, then adding all of these products together.
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