Relative formula mass
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I can calculate the relative formula mass of substances using data taken from a periodic table.
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The relative atomic mass is the mean mass of an atom compared to 1/12 of the mass of a carbon-12 atom.
The relative formula mass (RFM or Mr) is the sum of the relative atomic masses of all the atoms in a chemical formula.
%mass of an element in a compound = (relative mass of element in compound ÷ RFM of compound) × 100
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