A.它是由两种单质组成的混合物 | B.它是一种硅酸盐 |
C.它是一种新型化合物 | D.它是一种高聚物 |
A.488.3 kJ/mol | B.-488.3 kJ/mol | C.-244.15 kJ/mol | D.244.15 kJ/mol |
A.2CH4(g)+4O2(g)===2CO2(g)+4H2O(l) ΔH=+890 kJ·mol-1 |
B.CH4(g)+2O2(g)===CO2(g)+2H2O(l) ΔH=+890 kJ·mol-1 |
C.CH4(g)+2O2(g)===CO2(g)+2H2O(l) ΔH=-890 kJ·mol-1 |
D.1/2CH4(g)+O2(g)===1/2CO2(g)+H2O(l) ΔH=-890 kJ·mol-1 |
A.0.5 Q | B.Q | C.2 Q | D.5 Q |
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