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The oxidation number of oxygen in a compound is typically -2. In BaFeO4, barium has an oxidation number of +2 and iron has an oxidation number of +6. Since each oxygen atom is -2, you can calculate the oxidation number of each oxygen by solving for x in the equation 2x + 6 + 4(-2) = 0. This gives each oxygen an oxidation number of -2.

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