а) 2SO₂ + O₂ --> 2SO₃ 2+1+2=5
б) 4Li + O₂ -->2Li₂O 4+1+2=7
в) 4Al + 3O₂ --> 2Al₂O₃ 4+3+2=9
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а) 2SO₂ + O₂ --> 2SO₃ 2+1+2=5
б) 4Li + O₂ -->2Li₂O 4+1+2=7
в) 4Al + 3O₂ --> 2Al₂O₃ 4+3+2=9