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1.
(2020高二上·丰台期中)
下列反应的焓变表示甲烷的摩尔燃烧焓(燃烧热)的是（ ）
A . CH4(g)+2O2(g) =CO2(g)+2H2O(g) ΔH＝－802.3 kJ/mol
B . CH4(g)+2O2(g) =CO2(g)+2H2O(l) ΔH＝－890.3 kJ/mol
C . CH4(g)+ 
O2(g) =CO(g)+2H2O(l) ΔH＝－607.3 kJ/mol
D . CH4(g)+ O2(g) =CO(g)+2H2O(g) ΔH＝－519.3 kJ/mol
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