Na2O → NaOH →Na2SO4 → H2SO4 →MgSO4 → BaSO4

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The chemical reactions are as follows:

Na2O + H2O -> 2NaOH (Sodium oxide reacts with water to form sodium hydroxide)

2NaOH + H2SO4 -> Na2SO4 + 2H2O (Sodium hydroxide reacts with sulfuric acid to form sodium sulfate and water)

Na2SO4 + H2SO4 -> 2NaHSO4 (Sodium sulfate reacts with sulfuric acid to form sodium bisulfate)

2NaHSO4 -> Na2SO4 + H2SO4 (Sodium bisulfate decomposes to form sodium sulfate and sulfuric acid)

Na2SO4 + MgSO4 -> Na2Mg(SO4)2 (Sodium sulfate reacts with magnesium sulfate to form sodium magnesium sulfate)

Na2Mg(SO4)2 + BaCl2 -> BaSO4 + 2NaCl + MgCl2 (Sodium magnesium sulfate reacts with barium chloride to form barium sulfate, sodium chloride, and magnesium chloride)