Empirical formula for magnesium oxide?

I made an experiment at my school to determine the empirical formula for magnesium oxide. The result didnt turn out well. We got Mg3O. My teacher aske

I made an experiment at my school to determine the empirical formula for magnesium oxide. The result didnt turn out well. We got Mg3O. My teacher asked us to justify why our experiment was unsuccesful. What do you guys think?

or:I made an experiment at my school to determine the empirical formula for magnesium oxide. The result didnt turn out well. We got Mg3O. My teacher asked us to justify why our experiment was unsuccesful. What do you guys think?

or:You have not said anything to base an opinion on.

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