Помогите!!!!!!!!!!!
раставьте коэффицэнты в следующих химических уравнениях;
1)SO₂ + O₂→3O₃    2)N₂ + H₂→NH₃

3)Fe + CL₂→FeCL₃   4)Zn + HCL→ZnCL₂ + H₂
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