氢气、一氧化碳、辛烷、甲烷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
相同质量的氢气、一氧化碳、辛烷、甲烷完全燃烧时,放出热量最少的是
A.H2(g) |
B.CO(g) |
C.C8H18(l) |
D.CH4(g) |