<span>С+О2=СО2 </span>
<span>М(СО2)=44г\моль </span>
<span>М(О2)=32г\моль </span>
<span>пропорция </span>
<span>32г---------44 </span>
<span>Х-------------88 </span>
<span>Х=64 г(О2)</span>
Fe₂O₃ + 3CO = 2Fe + 3CO₂
2Fe + Cl₃ = 2FeCl₃
FeCl₃ + 3KOH = Fe(OH)₃ + 3KCl
Fe(OH)₃ + 3HNO₃ = Fe(NO₃)₃ + 3H₂O
Fe(NO₃)₃ + Zn = Zn(NO₃)₂ + Fe
Fe + 2HCl = FeCl₂ + H₂
3Fe + 2O₂ = Fe₃O₄