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explain the dipole moment of NB3 is lower than NH3.

explain the dipole moment of NB3 is lower than NH3.

Grade:12th pass

2 Answers

Bejoi Mathew
106 Points
6 years ago
WELL THAT IS BECAUSE DIPOLE MOMENT IS A VECTOR QUANTITY AND HENCE RESULTANT DIPOLE MOMENT DEPENDS ON THE DIRECTIONOF INDIVIDUAL DIPOLE MOMENTS.
IN NH3, NITROGEN IS much MORE ELECTRONEGATIVE(that they have greater electronegativity difference) THAN HYDROGEN SO THE EFFECTIVE DIPOLE MOMENT IS SAME AS THE DIRECTION IN WHICH THE 3 N-H DIPOLES.
IN NB3, NITROGEN IS AGAIN MORE ELECTRONEGATIVE BUT THE ELECTRONEGATIVITY DIFFERENCE IS LESS, hence the dipole moment would also be less because
p = q * d
 
HOPE THIS HELPS!
THANK YOU
Umakant biswal
5349 Points
6 years ago
@ mintu 
below arethe reasons 
1- both molecules are pyramidal in shape with aloan pairof electron in nitrogen atom .. 
2- the orbital dipole moment due to loan pair is in the same direction , as the resultant dipolemoment of the bonds . 
3- thirdly , the most electronegativity power of nitrogen will comes into play . 
HOPE IT CLEARS YOUR DOUBT 
ALL THE BEST ..

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