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BaCl₂ + Na₂SO₄---->BaSO₄(osad) + 2NaCl
Ba²⁺ + SO₄²⁻ ---->BaSO₄(osad)
2Na + Cl₂---->2NaCl
2Na° + Cl₂°---->2Na⁺ + 2Cl⁻
2SO₂ + O₂°---->2SO₃
2Al° + 3S°----->Al₂S₃(osad)