Posted by Grace on Saturday, March 12, 2011 at 1:13am.
since PH3 has a higher molar mass, it would be expected that it would have a higher BP than NH3, but that's not the case because of hydrogen bonding in NH3 and not in PH3. it occurs when H+ is attracted to lone pairs of atoms like N, O, F in another molecules.
other molecules that exhibit H-bonding are H2O, HF, R-OH, etc.
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