已知: HCl(aq)与NaOH(aq)反应的∆H= -55.6 kJ/mol; HCN(aq)与NaOH(aq)反应的∆H= -12.1 kJ/mol。则HCN在水溶液中电离的∆H等于
A.+ 43.5 kJ/mol | B.-67.7 kJ/mol |
C.+67.7 kJ/mol | D.-43.5 kJ/mol |
已知: HCl(aq)与NaOH(aq)反应的∆H= -55.6 kJ/mol; HCN(aq)与NaOH(aq)反应的∆H= -12.1 kJ/mol。则HCN在水溶液中电离的∆H等于
A.+ 43.5 kJ/mol | B.-67.7 kJ/mol |
C.+67.7 kJ/mol | D.-43.5 kJ/mol |