Polarity of NH3?

[Aya Shokair- Dis 2H]

Hi,
I am slightly confused because I was determining the polarity of NH3 and I came to the answer that it's polar because it contains polar bonds making the entire molecule polar. Overall, the hydrogens are more positively charged than the nitrogen. However, I remember in class Professor Lavelle saying ammonia is non-polar. Did I mishear him or is my reasoning wrong?

[nathansalce 3e]

Nh₃, or ammonia, is definitely polar. Nitrogen is more electronegative than hydrogen, thus pointing the dipole moments to the nitrogen. Nitrogen's lone pair pushes the hydrogen away, thus making the dipole moments point in a common direction without cancelling out, making Nh₃ a polar molecule.

[AtreyiMitra2L]

Maybe you heard ammonium? That would be polar because there is a net dipole moment of 0. Ammonia would definitely be polar because of the lone pair on the nitrogen. The lone pair is why the vectors wouldn't cancel out and why the molecule is now polar. Whenever there is a lone pair on the central atom, the molecule is polar.

[Alexia Joseph 2B]

Remember that NH3's lewis structure is a central nitrogen atom, attached to 3 hydrogen atoms and with one lone pair of electrons. The molecule is polar because the molecule is not symmetrical. There is a lone pair on the nitrogen, so the dipoles cannot cancel.

[Lily Guo 1D]

NH3 is polar because it has 3 dipoles that do not cancel out. Each N-H bond is polar because N is more electronegative than H. NH3 is overall asymmetrical in its VSEPR shape, so the dipoles don't cancel out and it is therefore polar.