What's the relationship between empirical formula and molecular formula Watch

Midnightstars
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Chemistry aqa a level
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jsg9
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Empirical formula is the simplest whole number ratio of atoms of each element present in a compound.

Molecular formula is the actual number of atoms of each element present in a compound.

So, if you were given the empirical formula CH3 but were given a molar mass of 30g mol^-1 and asked to work out the molecular formula it must be C2H6 because the molar mass of CH3 is 15g mol^-1 because carbon is 12g mol^-1 and hydrogen is 1g mol^-1. 30/15 = 2 - so, you multiply the number of atoms in the compound in the empirical formula by 2 (or whatever number your division gives) to find the molecular formula.
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