AC(石墨)+O2(g)=CO2(g)△H=-394kJ/mol
B2C(石墨)+2O2(g)=2CO2(g)△H=-394kJ/mol
CC+O2=CO2△H=394kJ/mol
DC(石墨)+O2(g)=CO2(g)△H=394kJ/mol
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