[sapta]

HF forms stronger hydrogen bonds than H2O.Why then has H2O a higher B.P. than HF?

my thinking is that HF can stay in associated form even as a gas.So,maybe less no. of bonds need to be splitted.is this the reason?

[sdekivit]

HF forms stronger hydrogen bonds than H2O.Why then has HF a higher B.P. than H2O?

my thinking is that HF can stay in associated form even as a gas.So,maybe less no. of bonds need to be splitted.is this the reason?

You correctly state that HF will give stronger H-bonds. Thus if we have 2H2O connceted with a H-bond and 2HF connected with a H-bond. To dissociate these, for which is the needed energy higher ? (H2O can make multiple H-bonds though)

[sapta]

i had made a horrible mistake in posting my question.i have corrected it now.

[sdekivit]

i had made a horrible mistake in posting my question.i have corrected it now.

because it can make multiple H-bonds ( 3 of H2O to 2 of HF) many low energybonds makes a total of a high energy system.

[hmx9123]

sdekivit is correct.  Even though a single hydrogen bond in HF is stronger than one in water, water has multiple hydrogen bonds, which, when summed, have a greater intermolecular force than that of HF, as HF can only H-bond to two other molecules and water is H-bound to 4, IIRC.