Posted by d on Friday, December 31, 2010 at 3:50pm.
In the series HI, HBr, HCl, HF, the boiling point decreases because the molar mass is decreasing; however, HF (remember F has the highest electronegativity of any element) has hydrogen bond which RAISES the boiling point of HF. H2O, NH3, HF are in the same category. HF should be a gas, H2O should be a gas but they aren't because of H bonding. NH3 IS a gas BUT the boiling point is much higher than it should be (from the trend) SbH3, AsH3, PH3, NH3.
Which answer is it then? I feel like it's just I because HF is an exception.
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