A.2CH4(g)+7/2O2(g)=CO2(g)+CO(g)+4H2O(1) △H=-1214kJ/mol
B.2CH4(g)+7/2O2(g)=CO2(g)+CO(g)+4H2O(g) △H=-1038kJ/mol
C.3CH4(g)+5O2(g)=CO2(g)+2CO(g)+6H2O(1) △H=-1538kJ/mol
D.3CH4(g)+5O2(g)=CO2(g)+2CO(g)+6H2O(g) △H=-1840kJ/mol
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