已知:HCN(aq)与NaOH(aq)反应的ΔH=-12.1 kJ·mol-1;HCl(aq)与NaOH(aq)反应的ΔH=-57.3 kJ·mol-1,则HCN在水溶液中电离的ΔH等于
A.-69.4 kJ·mol-1 | B.-45.2 kJ·mol-1 |
C.+45.2 kJ·mol-1 | D.+69.4 kJ·mol-1 |
已知:HCN(aq)与NaOH(aq)反应的ΔH=-12.1 kJ·mol-1;HCl(aq)与NaOH(aq)反应的ΔH=-57.3 kJ·mol-1,则HCN在水溶液中电离的ΔH等于
A.-69.4 kJ·mol-1 | B.-45.2 kJ·mol-1 |
C.+45.2 kJ·mol-1 | D.+69.4 kJ·mol-1 |