Question

which one has more dipole moment NH3, or NF3, and why​

Answer 1

Answer:

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Answer 2

To determine that which of the two has more dipole moment, consider this:

Electronegativity for oxygen(O), nitrogen(N) and fluorine(F) is defined in the other F>O>N. Now, from this order we may conclude that the electronegative for Fluorine(F) and Nitrogen(N) is F>>N. So, you might think that Fluorine, being more electronegative than Nitrogen, will cause the dipole moment of NF3 to be more than that of NH3, but it ain't true. So, to understand this, you may wanna read further on the Geometry.

The thing is that the spatial geometry for both NH3 and NF3 is Pyramidal, hence, the NH3 molecule tends to have a net upward dipole moment and the NF3 molecule, on the contrary, cancel out the net effect due to the vector addition of the electronegative forces. Therefore, the NH3 molecule has a higher magnitude of dipole moment.