Сa0-Ca+2-CaCO3-Ca+2-Ca0 решить!!!
2Ca+O2=2CaO
CaO+CO2=CaCO3
CACO3=CaO+CO2
3CaO+2AL=AL2O3+3Ca
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2Ca+O2=2CaO
CaO+CO2=CaCO3
CACO3=CaO+CO2
3CaO+2AL=AL2O3+3Ca