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why NCl 3 is an exothermic compound and NF 3 is an endothermic compound?

why NCl3 is an exothermic compound and NF3 is an endothermic compound?

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ruchi yadav
askIITians Faculty 27 Points
10 years ago
The high enthalpy of formation of NCl3, is due to large difference in the size of the N and Cl atoms, as Nitrogen belongs to second period and Cl atoms belongs to third period, this large difference makes the N-Cl bond weak, whereas, in NF3, since the size of the atoms is small, as both the atoms belongs to second period, therefore, the N-F bond is strong and it is an exothermic compound.


Thank You
Ruchi
Askiitians Faculty

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