Relative formula mass, the mole, empirical formulae, percentage yield, concentration and balancing equations.
Relative masses
Relative atomic mass (Aᵣ) is the mass of an atom relative to carbon-12. Relative formula mass (Mᵣ) = sum of the Aᵣ of every atom in the formula. E.g. Mᵣ(H₂O) = (2×1) + 16 = 18; Mᵣ(CaCO₃) = 40 + 12 + (3×16) = 100.
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