化工生产中常用的CO和H2，可通过烃与水蒸气反应得到。其中甲烷可发生以下两个反应：
①CH4(g)＋1/2O2(g)== =2H2(g)＋CO(g) ΔH＝－36 kJ/mol
②CH4(g)＋H2O(g)===CO(g)＋3H2(g) ΔH＝＋216 kJ/mol下列热化学方程式中，反应热为零的是A.4CH4(g)＋O2(g)＋2H2O(g)===4CO(g)＋10H2(g)B.7CH4(g)＋3O2(g)＋H2O(g)==="7CO" (g)＋15H2(g)C.3CH4(g)＋O2(g)＋H2O(g)===3CO(g)＋7H2(g)D.5CH4(g)＋2O2(g)＋H2O(g)===5CO(g)＋11H2(g)
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B解析由盖斯定律可求得四个选项的反应热依次为：＋360 kJ/mol、0、＋144 kJ/mol、＋72kJ/mol