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-285.8kJ/mol 285.8kJ/mol -241.8kJ/mol 241.8kJ/mol
438.6 kJ/mol 241.8 kJ/mol 285.8 kJ/mol 无法确定
-44.2 kJ·mol-1 +44.2 kJ·mol-1 -330 kJ·mol-1 +330 kJ·mol-1
CH3OH(l)的燃烧热是|ΔH1/2| CO的燃烧热是|ΔH2/2| CH3OH(l)+O2(g)= CO(g) + 2H2O(l)ΔH. =ΔH1-ΔH2+4ΔH3 ΔH3>0
-44.2kJ•mol-1 +44.2kJ•mlo-1 -330kJ•mol-1 +330kJ•mlo-1
-44.2 kJ·mol-1 +44.2 kJ·mol-1 -330 kJ·mol-1 +330 kJ·mol-1
-44.2 kJ·mol-1 +44.2 kJ·mol-1 -330 kJ·mol-1 +330 kJ·mol-1
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
-44.2kJ/mol +44.2kJ/mol -330kJ/mol +330kJ/mol
反应②不需要加热就能进行 CO(g)+2H2(g)===CH3OH(g) ΔH.>-90.5 kJ·mol-1 甲醇的燃烧热ΔH.=-764 kJ·mol-1 若CO的燃烧热ΔH.=-283.0 kJ·mol-1,则H2的燃烧热ΔH.=-285.8 kJ·mol-1
4a+4b+4c 2a-2b+6c 2a-2b+2c 2a-6b+2c
-44.2kJ·mol-1 +44.2kJ·mol-1 -330kJ·mol-1 +330kJ·mol-1