написать цепочку превращений. С-СН4-СО2-СаСо3-СаСl2
С+2H2=CH4
CH4+2O2=CO2+2H2O
CaO+Co2=CaCO3
CaCO3+2HCl=CaCl2+H2O+CO2
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С+2H2=CH4
CH4+2O2=CO2+2H2O
CaO+Co2=CaCO3
CaCO3+2HCl=CaCl2+H2O+CO2