Nf3 is an exothermic compound whereas ncl3 is not


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NCl3 is an endothermic compound while NF3 is an exothermic compound why..?

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The enthalpy of formation of NCl3 is due to the large size difference of N and Cl atoms as N belongs to second period and Cl belongs to the third period making the N-Cl bond weak, whereas in  NF3, since both the atoms belongs to the second period & are small in size therefore N-F bond is strong making it exothermic.

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