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