Question

what is dipole moment?
and compare NF3 and NH3 with respect to dipole moment which has greter dipole moment​

Answer 1

Answer:

In NH3, N is more electronegative than H. So, N pulls the electrons from H towards itself and so, the direction ofmoment due to the N-H bonds is in the same direction as that of the lone pair of electrons on Nitrogen. ... And, so wehave NH3 whose dipole moment is much higher than that of NF3.

Answer 2

Answer:

A dipole moment arises in any system in which there is a separation of charge. They can, therefore, arise in ionic bonds as well as in covalent bonds. Dipole moments occur due to the difference in electronegativity between two chemically bonded atoms.A bond dipole moment is a measure of the polarity of a chemical bond between two atoms in a molecule.

In NH3, 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. And, so we have NH3 whose dipole moment is much higher than that of NF3.