Расставьте коэффициенты)Помогите пожалуйста....
1)Н2С+O2=CO2+H2O
2)Al+HCl=AlCl+H2
3)MgO+HNO3=Mg(NO3)2+H2O
4)Al2O3+HCl=AlCl3+H2O
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