The `HF_(2)^(Θ)` ion solid state and in liquid `HF` but not in the dilute aqueous solution
At `300 K` and `1.00 ` atm, the density of `HF` is `3.17 gL^(-1)` We conclude that there is a .

Options

A. dimer formation by H-bonding
B. trimer formation by H-bonding
C. tetramer formation by H-bonding
D. ionisation formation `HF_(2)^(Θ)` and `H^(o+)`

Answer

C

Explanation

`PV = nRT`
`P = (n)/(V) RT`
` = (w_(2)RT)/(MW_(2) xx V) = (dRT)/(MW_(2))`
`MW_(2) = (dRT)/(P) = (3.17 xx 0.082 xx 300)/(1.00) = 77.982`
`MW` of `HF =19`
Number of `HF` molecules associated ` = (77.982)/(19) ~ 4`
Hence there is tetramer formation by H-bonding .