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You find the total RFM of the formula, which for Sulphur Dioxide is 64g/mol.
Find the RAM of the elements in the compount which is 32 for Sulphur and 16 for Oxygen, but since we have two Oxygens it's 32.
You then put the molecular weight of the element over the molecular weight of the compound and multiply it by one hundred.
Shazam.