Why is the boiling point of #NH_3# higher than the boiling point of #PH_3# and #AsH_3#?
1 Answer
Because the degree and magnitude of intermolecular bonding between ammonia molecules is much greater than that between phosphine, and arsine molecules.
Explanation:
Ammonia, boiling point
On the other hand, phosphorus and arsenic are much less electronegative compared to nitrogen, and hydrogen bonding does not operate in their hydrides as an intermolecular force.