Stuck - Hydrogen Bonding!

[XPFMember]

Assalamoalaikum!!
I am confused in hydrogen bonding! Why is it stronger in water than in -NH or HF?
Is it because for each hydrogen there needs to be a lone pair to form a hydrogen bond? i mean like there are 3 lone pairs in HF but only one hydrogen so does that mean it'll form only one hydrogen bond? :%)

 

[destined007]

There's a difference between stronger hydrogen bond and the number of hydrogen bond.
The strongest hydrogen bond is found in HF because F is the most electronegative element. However, HF forms only 2 H bonds because there's only 1 H atom in HF. Its something like this: --H-F----H-F----H-F--
In case of water, the hydrogen bonds formed between 2 molecules are weaker than HF to HF molecules. However, there are 2 hydrogen atoms in each molecule as well as 2 lone pairs of oxygen. So each water molecule can form up to 4 H bonds.
In case of NH3, there is only 1 lone pair so only one H bond.