The relative formula madd of a compound comes from the total mass of all of the elments within the compound. So in the case of calcium carbonate (CaCO3) we have; 1 x Ca 1 x C 3 x O So we first need to know the relative mass nnumber (Mr) of these individual elements. This information comes from the periodic table and is determined by the number of protons + neutrons in an atom. Mass number = protons + neutrons So if we look at the elements in our compound we have; 20Ca40 6C12 8O16 In each case the mass number is the bottom right number (in bold), we can now calculate our relative formula mass using these numbers so we have; Ca(1 x 40) + C(1 x 12) + O(3 x 16) = 40 + 12 + 48 = 100 g/mol The units of relative formula mass are g/mol, which tells us that 1 mole of CaCO3 has a mass of 100 g. Open in App
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