Answer:
Step-by-step explanation:
In any empirical formula problem you must first find the mass % of the elements in the compound. ...
Then change the % to grams. ...
Next, divide all the masses by their respective molar masses. ...
Pick the smallest answer of moles and divide all figures by that.
Since our answer for magnesium is not close enough to round to the nearest whole number we must choose a factor to multiply all the figures by that will yield us whole numbers
Lastly, the coefficients calculated in the previous step will become the subscripts in the chemical formula.