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Counting Molecules by the Gram
- For elements, the molar mass is the mass of 1 mol of atoms of that element.
- For compounds, the molar mass is the mass of 1 mol of molecules or formula units of that compound.
- Ionic compounds do not contain individual molecules.
- We convert between the mass of a compound and moles of the compound, and then we calculate the number of molecules (or formula units) from moles.