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NCl3 is endothermic,nf3 is exothermic?

NCl3 is endothermic,nf3 is exothermic? 

Grade:12

2 Answers

Harishwar IIT Roorkee
askIITians Faculty 50 Points
7 years ago
The NN bond energy is huge (-ve) and formation will only be thermodynamically allowed if X-X is low -ve (the F-F bond strength is anomalously small) and the N-X bond energy is high (-ve). The N-F covalent bond is much stronger than the N-Cl bond due to better 2p-2p overlap.NCl3 can be made but is explosively unstable
Suraj Prasad IIT Patna
askIITians Faculty 286 Points
7 years ago
the reason lies in the difference of size . N-Cl bond is weak and N-F bond is strong. So it is exothermic

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