Why is the dipole moment of NH3 greater then that of NF3 ??
Answers
Dipole moment of greater then that of
Explanation:
In case of , N is more electronegative than H. So, N pulls the electrons from H towards itself and so, the direction of moment due to the N-H bonds is in the same direction as that of the lone pair of electrons on Nitrogen.
In case of , F is more electronegative than N. So, all F atoms pull the electrons towards themselves. And, this resultant moment is opposite to the directions of that of the lone pair of electrons on the 'N' atom. And, since Dipole Moment is a vector quantity, the net dipole decreases.
Hence, we have whose dipole moment is much higher than that of
.
❤.In NH3, the directionof the orbital dipole moment due to lone pair is in the same direction of the 'resultant dipolemoment' of the 3N-H bonds.
❤.Hence,the net dipole moment of NH3 is positive.
❤. But in NF3, molecule the direction of the orbital dipole moment due to lone pair is in the opposite direction to the 'resultant dipole moment'of the 3 N-F bonds.
❤.Hence, its net dipole moment decreases.
❤. Therefore,dipole moment of NH3 is greater than that of NF3
