Final answer:
The permanent electric dipole moment of NH₃ is 1.889 × 10-29 Cm or 1.89 D. NH₃ is a polar molecule, with the nitrogen end having a partial negative charge and the hydrogen end having a partial positive charge.
Step-by-step explanation:
The permanent electric dipole moment of the ammonia molecule NH₃ is equal to 1.889 × 10-29 Cm or 1.89 D (Debye).
The dipole moment of a molecule is the vector sum of the dipoles of the individual bonds. In NH₃, the nitrogen atom has a partial negative charge (-2e), while each hydrogen atom has a partial positive charge (+e). The dipole moment is the result of the difference in electronegativity between nitrogen and hydrogen.
This dipole moment indicates that NH₃ is a polar molecule, with the nitrogen end having a partial negative charge and the hydrogen end having a partial positive charge.