Question

Both nh3 and nf3 have identical shape and same state of hybridisation but still the two molecules have different dipole moment values. How will you account for it?

Answer 1

Answer:

Both NH3 and NH3 have same structure but on account of difference in the electronegativities of F and H with respect to nitrogen and presence of lone pairs make the different dipole moments

Explanation:

Answer 2

Answer:

Dipole moment of NF3 decreases.

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Explanation:

As in NH3, N is more e- -ve, so it will attract the e- from H to itself.

But in NF3, F is more e- -ve than N, so F will attract all the e- from N.

So the Dipole Moment of NF3 decreases due to opposite direction of e- attraction.

More Explanation: Both NH3 and NF3 have pyramidal geometries and the electronegativity difference of bonding atoms in both NH3 (3.0-2.1=0.9) and NF3 (4.0-3.0=1.0) mlecules are also nearly the same. But the dipole moment of NH3 (1.46D) is more than that of NF3 (0.24D). This is explained on the basis of the difference in the directions of the dipole moments. In NH3 the dipole moment pair. But in NF3, the dipole moments of the three N-F bonds are in the direction opposite to that of the lone pair. Therefore, the resultant dipole moment in NH3 is more than in NF3.