Question

NH3 possess high boiling point. Why??

Answer 1

However, ammonia, unlike phosphine, hashydrogen bonds due to the presence of a covalent bond between hydrogen and highly electronegative nitrogen with a lone pair. Hydrogen bonds are stronger than London dispersion forces, therefore ammonia hasstronger intermolecular forces and higher boiling point.


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Answer 2

PH3 is a larger molecule with greater dispersion forces than ammonia, NH3 has very polar N-H bonds leading to strong hydrogen bonding. This the dominant intermolecular force and results in a greater attraction between NH3 molecules than there is between PH3