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Calcaulate the molecular weight of HF, i...

Calcaulate the molecular weight of `HF`, if density of `HF`gas is `3.17 g//L` at `300K` and `1.0 atm`. Comment of the result .

Text Solution

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`PV =w/mRT`
`or ` P = w/ ( V .m) RT`
or `m = (dRT) /F = (3. 17 xx 0.0821 xx 300)/1 =78.08`
Molecular weight of HF in gaseous state si ` 78.08`
whereas is normal amolecualr weight si ` 1 + 18 =19`
Theus `HF` in gaseous state from a terramer due to straong H-bonding .
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