氢气(H2)、一氧化碳(CO)、辛烷(C8H18)、甲烷(CH4)的热化学方程式分别为: H2(g) + 1/2O2(g) = H2O(l);△H= -285.8 kJ/mol CO(g) + 1/2O2(g) = CO2(g);△H= -283.0 kJ/mol C8H18(l) + 25/2O2(g) = 8CO2(g) + 9H2O(l);△H= -5518 kJ/mol CH4(g) + 2O2(g) = CO2(g) + 2H2O(l);△H= -890.3 kJ/mol 相同质量的H2、CO、C8H18、CH4完全燃烧时,放出热量最少的是 |
[ ] |
A.H2(g) B.C8H18(l) C.CO(g) D.CH4(g) |