已知氢气和碳的燃烧的热化学方程式为 ①2H2(g)+O2(g)==2H2O(l) △H1=-a kJ·mol-1 ②H2(g)+1/2O2(g)==H2O(g) △H2=-b kJ·mol-1 ③C(s)+1/2O2(g)==CO(g) △H3=-c kJ·mol-1 ④C(s)+O2(g)==CO2(g) △H4=-d kJ·mol-1 那么,下列说法正确的是 |
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A.氢气的燃烧热为a kJ·mol-1 B.碳的燃烧热为d kJ·mol-1 C.一氧化碳的燃烧热为-(d-c)kJ·mol-1 D. |