help with chemical bonding?

Question

does some one know how to calculate the dipole moment........for instance say NH3.......

Answer 1

yes

Answer 2

To see if there is a dipole moment, fairly straightforward. Use VSEPR and you will see that it is a non-planar molecule, so it must have a dipole moment.

To calculate the size of the dipole moment you would need to use some high-powered quantum mechanical calculations to find out the complete electron distribution.

To get a good idea of the dipole moment, there are empirical methods which assign a certain size dipole to each N-H bond and to the lone pair on nitrogen. You then just do the necessary vector addition.

No easier answer. Sorry, that's how it is.

Answer 3

Firstly, one must know the structure of the molecule and the relative positions of the lone pairs.

Next, use vector to calculate the dipole moment. The bond length, electronegativity of the elements are also involved in the calculation.

But then again, one can use a commercial computational chemistry program to calculate it.