Which out of and has a higher dipole moment and why?
Here both have a 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 than that of hydrogen. Hence it is expected that the net dipole moment of is greater than .
However, has a net dipole moment of 1.46D and has a net dipole moment of 0.24D. which is greater than $.
This is because of the direction of the dipole moments of each bond in and .
The moments of the lone pair in partly cancel out. But in the resultant moment add up to the bond moment of the lone pair.