An oxide of chromium is found to have the following composition: 28.2% Cr and 71.8% O. How would you determine this compound's empirical formula?
Change the % to grams, change grams to moles, and then find a mole ratio.
If there were 100 grams of the compound 28.2 grams would be Cr and 71.8 grams would be oxygen.
To set up a ratio divide the moles Cr into the moles O
The empirical formula based on the data given would be