How would you find the molecular formula from the empirical formula?
You will need to know the empirical formula and the molar mass in order to do this.
Let's say you have a compound which contains nitrogen and oxygen.
Experimental evidence reveals that the ratio of nitrogen to oxygen is 1:2, so the empirical formula would be
The mass of
If additional experimental evidence reveals that the molar mass of the same compound is 92g/mol you would need to multiply the empirical formula by 2 to get the molar mass of the compound.
2(14 + 16 + 16) = 92
Doubling the empirical formula will give a molecular formula of
Here is another example:
Video from: Noel Pauller
Hope this helps!