the top number in the symbol is the relative atomic mass. The relative formula mass is when the atomic masses of each element in a compound are added together
E.g. The relative atomic mass of oxygen is 16, but
The relative formula mass of water =
H20 =
2 x H , 1 x O =
2 x 1 + 1 x 16 = 18.
The relative formula mass of water is 18. This would not be shown on the emprical formula of the compound.
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