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  • Which out of NH_3 and NF_3 has higher dipole moment and why?

4.23     Which out of NH_{3}  and NF_{3}  has higher dipole moment and why ?

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 Here both have central atom Nitrogen and it has a lone pair of electrons with three bond pairs.

Hence both molecules have a pyramidal shape.

The electronegativity of fluorine is more as compared to the hydrogen. Hence it is expected that the net dipole moment of NF_{3} is greater than  NH_{3}.

However NH_{3} has the net dipole moment of 1.46D and  NF_{3} has the net dipole moment of 0.24D. which is greater than  NF_{3}.

This is because of the direction of the dipole moments of each individual bond in NH_{3} and NF_{3}.

The moments of the lone pair in NF_{3} partly cancel out. But in NH_{3} the resultant moment add up to the bond moment of the lone pair.

Posted by

Divya Prakash Singh

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