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CH4(g)＋2O2(g)＝CO2(g)＋4H2O(g) ΔH＝－890 kJ/mol CH4(g)＋2O2(g)＝CO2(g)＋2H2O(l) ΔH＝＋890 kJ/mol CH4(g)＋2O2(g)＝CO2(g)＋2H2O(l) ΔH＝－890 kJ/mol 
CH4(g)＋O2(g)＝CO2(g)＋H2O(l) ΔH＝－890 kJ/mol
2CH4( g)+4O2(g)=2CO2(g)+4H2O(1) △H = +890kJ·mol-1 CH4(g)+2O2(g)=CO2(g)+2H2O(g) △H = +890 kJ·mol-1 1／2CH4(g)+O2(g)=1／2CO2(g)+H2O(g) △H = —445 kJ·mol-1 CH4(g)+2O2(g)=CO2(g)+2H2O(1) △H = —890 kJ·mol-1
CO(g) +1/2O2(g) ==CO2(g) △H.＝-283.0 kJ/mol C(s) +1/2O2(g) ==CO(g) △H.＝-110.5 kJ/mol H2(g) +1/2O2(g)==H2O(g) △H.＝-241.8 kJ/mol 2C8H18(l) +25O2(g)==16CO2(g)+18H2O(l) △H.＝-11036 kJ/mol
CO(g) +1/2O2(g) ==CO2(g); △H.＝－283.0 kJ/mol C(s) +1/2O2(g) ==CO(g); △H.＝－110.5 kJ/mol H2(g) +1/2O2(g)==H2O(g); △H.＝－241.8 kJ/mol 2C8H18(l) +25O2(g)==16CO2(g)+18H2O(l); △H.＝－11036 kJ/mol
H2(g) CO(g) C.8H18(l) CH4(g)
H2(g) CO(g) C.8H18(l) CH4(g)
由反应①、②可知如图所示的热化学方程式为CO（g）+H2O（g）==== CO2（g）+H2（g）ΔH = -41.2 kJ·mol-1 H2的燃烧热为241.8 kJ·mol-1 H2（g）转变成H2O（g）的化学反应一定要释放能量 根据②推知反应H2（g）+1/2O2（g）==== H2O（l）ΔH > -241.8 kJ·mol-1
升高温度 再加入2n mol H2 再加入nmol CO和nmol H2O 再加入2n mol CO2和2n mol H2
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