attractive force present between ammonia ions repulsive force also exist but not at high rate
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The strongest intermolecular force in ammonia is hydrogen bonding. This occurs because the nitrogen atom in ammonia can form a hydrogen bond with a hydrogen atom from another ammonia molecule, resulting in a relatively strong attraction between the molecules.
The predominant intermolecular force in ammonia (NH3) is hydrogen bonding. Hydrogen bonding occurs between the hydrogen atom of one ammonia molecule and the lone pair of electrons on the nitrogen atom of another ammonia molecule. This results in relatively strong interactions between the molecules.
The predominant intermolecular force in methane is London dispersion forces, in ammonia it is hydrogen bonding, in nitrogen trifluoride it is dipole-dipole interactions.
Dipole forces and London forces are present between these molecules.
Ammonia has a higher boiling point than phosphine because ammonia molecules are held together by stronger hydrogen bonds, compared to the weaker van der Waals forces between phosphine molecules. This results in a higher amount of energy needed to overcome the intermolecular forces and cause the substance to boil.
AlH3 alane is a covalent solid and is a giant molecule, so no intermolecular forces will be present. Planar AlH3 molecules have been isolated at very low temperatures. AlH3 molecules would be predicted to have no dipole moment due to their shape. The only intermolecular forces would be London dispersion forces.