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Physical Properties of Haloarenes

The vapour de...

Question

The vapour density of a sample of hydrogen fluoride gas is found to be 12.5. If it is due to dimerisation of some HF molecules to $H_{2} F_{2}$ molecules, then the percentage of HF molecules dimerised is: (F = 19)

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Solution

By using the formula,
$Vapour density = \frac{M o l a r M a s s}{2}$
Molar Mass= Vapour density $\times 2$
$M_{a v g} = 12.5 \times 2 = 25 2 H F \to H_{2} F_{2} 1 - α α / 2 1 - α / 2 = n_{t o t a l}$
Mole = mass /molar mass
$(1 - \frac{α}{2}) \times 25 = 1 \times 20 α = 0.4$

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