问题
选择题
已知:HCN(aq)与NaOH(aq)反应的△H=-12.1 kJ·mol-1;HCl(aq)与NaOH(aq)反应的△H=-55.6 kJ·mol-1。则HCN在水溶液中电离的△H等于 [ ]
A. -67.7 kJ·mol-1
B. -43.5 kJ·mol-1
C. +43.5 kJ·mol-1
D. +67.7 kJ·mol-1
答案
答案:C
已知:HCN(aq)与NaOH(aq)反应的△H=-12.1 kJ·mol-1;HCl(aq)与NaOH(aq)反应的△H=-55.6 kJ·mol-1。则HCN在水溶液中电离的△H等于 [ ]
A. -67.7 kJ·mol-1
B. -43.5 kJ·mol-1
C. +43.5 kJ·mol-1
D. +67.7 kJ·mol-1
答案:C