How do you find the empirical formula of magnesium oxide, when magnesium ribbon is burned in a crucible...and a #0.91*g# of material is present?
There are insufficient data here...........
We need (i) the tare mass of the crucible;
(ii) the mass of the crucible and the magnesium metal BEFORE the reaction;
(iii) the mass of the crucible and the resultant magnesium oxide AFTER the rxn.
We interrogate the reaction:
And thus we need the mass of the metal, and the mass of the metal oxide. Do you have