An unknown compound was found to have a percent composition as follows 47.0% potassium, 14.5% carbon, and 38.5% oxygen. What is its empirical formula?
In 100 g of compound there are 47.0 g potassium, 14.5 g carbon, and 38.5 g oxygen. Why?
We divide thru by the atomic masses:
Now if we divide thru by the lowest ratio, we get
You have likely got the dipotassium salt of oxalic acid,