己知: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.—67.7 kJ/mol | B.—43.5 kJ/mol | C.+43.5 kJ/mol | D.+67.7kJ/mol |
己知: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.—67.7 kJ/mol | B.—43.5 kJ/mol | C.+43.5 kJ/mol | D.+67.7kJ/mol |