1.物质A在一定条件下可发生一系列转化,由图判断下列关系错误的是( )
A.A→F,ΔH=-ΔH6
B.ΔH1+ΔH2+ΔH3+ΔH4+ΔH5+ΔH6=1
C.C→F,|ΔH|=|ΔH1+ΔH2+ΔH6|
D.|ΔH1+ΔH2+ΔH3|=|ΔH4+ΔH5+ΔH6|
解析:F→A,ΔH=ΔH6,则A→F,ΔH=-ΔH6,A正确;6个ΔH全部相加,ΔH=0,B错误;C→F的ΔH=-(ΔH6+ΔH1+ΔH2),C正确;A→D的ΔH=ΔH1+ΔH2+ΔH3,D→A的ΔH=ΔH4+ΔH5+ΔH6,二者的绝对值相等,符号相反,D正确。
答案:B
2.已知:①2CH3OH(g)===CH3OCH3(g)+H2O(g) ΔH1=-23.9 kJ·mol-1
②2CH3OH(g)===C2H4(g)+2H2O(g)
ΔH2=-29.1 kJ·mol-1
③C2H5OH(g)===CH3OCH3(g)
ΔH3=+50.7 kJ·mol-1
则C2H4(g)+H2O(g)===C2H5OH(g)的ΔH( )
A.-45.5 kJ·mol-1 B.+45.5 kJ·mol-1
C.-55.9 kJ·mol-1 D.+55.9 kJ·mol-1