Расставьте коэффициент в химических уравнениях:
1) Fe₂O₃ + HNO₃ = Fe(NO₃)₃+H₂O
2) HNO₃ = H₂O + NO₂ + O₂
3) NaOH + Cu(NO₃)₂ = Cu(OH)₂ + NaNO₃
Заранее спасибки:)
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