已知:HCN(aq)与NaOH(aq)反应的△H=-12.1kJ·mol-1;HCl(aq)与NaOH(aq)反应的△H=-55.6kJ·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 |
已知:HCN(aq)与NaOH(aq)反应的△H=-12.1kJ·mol-1;HCl(aq)与NaOH(aq)反应的△H=-55.6kJ·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 |