If NH3, HF and H20 all have H-bonding, why is H2O's boiling point(100) higher than HF(19.5) and NH3(-33)?

Question

anonymous · Answer

Guys can someone helpp im really stuck :(

chmvijay · Answer

it again depends on the strength of hydrogen bonding and molecular structure :)

chmvijay · Answer

WELCOME TO OPENS STUDY

anonymous · Answer

thanks

anonymous · Answer

so how would I know if which one has a higher boiling point?

chmvijay · Answer

u can't just like that know :) it sometimes

anonymous · Answer

so how would u maybe work it out? is there like a rule for different compounds?

chmvijay · Answer

yaaa it depends on the electronegativity of element present tin that molecule :) more the electronetive is the element more stronger it form the hydrogen bond with the H of another molecule

chmvijay · Answer

not only hydrogen bonding some other bonds also counts for this different in boiling point :)

anonymous · Answer

I thought fluorine had a higher negativity than nitrogen or oxygen tho?

chmvijay · Answer

but they have  different structures and bondings :)  u can say that rule  for 
HF HCl HBr and HI and not for different molecules

anonymous · Answer

oh okayy

chmvijay · Answer

got it KAJAL :) are u from India and new to this site ?

anonymous · Answer

yeahh im new to the site

chmvijay · Answer

ok its called OPEN STUDY :) and u can study all subjects here for free and u can ask ur question here and also can answer if u know  :) its international site u can find lots of school and college students here :) it will be a great site for student s to learn and get things shared :)

anonymous · Answer

yeahh I think i'll definitely use this site again

chmvijay · Answer

thank you :)

anonymous · Answer

anyway, im gonna go now

chmvijay · Answer

bye :)

anonymous · Answer

thanks for your help :)

chmvijay · Answer

ur welcome

aaronq · Answer

Because each molecule can make a different amount of hydrogen bonds at a given time. 
$H_2O$ can make up to 4, HF only 1, $NH_3$ can make up to 4 (though i'm not sure why there would be such a large difference between it and water. O-H bond is more polarized than N-H, which accounts for a few degrees maybe, but theres definitely other details in the picture).