反应①:C(s)+ O2(g)=CO(g) △H1
反应②:C(s)+H2O(g)=CO(g)+H2(g) △H2
反应③:CO(g)+2H2(g)=CH3OH(g) △H3=-90.1 kJ·mol-1
反应④:2CH3OH(g)=CH3OCH3(g)+H2O(g) △H4 , 能量变化如下图所示
反应⑤:3CH3OH(g) CH3CH=CH2(g)+3H2O(g) △H5=-31.0 kJ·mol-1
下列说法正确的是