An unknown compound was found to have a percent composition as follows: 47.0% potassium, 14.5% carbon, and 38.5% oxygen. What is empirical formula? If the true molar mass of the compound is 166.22 g/mol, what is its molecular formula?
As with all these problems, we assume a
We divide thru by the smallest molar quantity to give the empirical formula:
Now the molecular formula is always a whole number of the empirical formula:
And thus with the molecular mass, we can solve for
The compound is LIKELY the potassium salt of oxalic acid,