Question

Why nh3 has more dipole moment than nf3

Answer 1

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♦In both molecules i.e NH3 and NF3 the central atom (N) has a lone pair electron and there are three bond pair .hence both molecules have pyramidal shape.since, fluorine is more electronegative than hydrogen.It is expected that the net dipole moment of NH3 is greater than that of NF3 .
the resultant moment of N-H bond add up to the bond moment of lone pair (the two being in the same direction) whereas, that of the three N-F bonds partly cancles the moment of the lone pair .

hence , the dipole moment of NF3 is less than that of NH3

so , NH3 has more dipole moment ♦

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Answer 2

Dipole moment of NH3 is higher than NF3 molecule.Both the molecules have pyramidal shape with a lone pair of electrons on nitrogen atom. There is a greater difference in electronegativity between nitrogen and hydrogen than there is between nitrogen and fluorine. the bond dipoles oppose the effect of the lone pair.