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Molecules and Atomicity

At 48 ∘ the...

Question

At $48^{\circ}$ the vapour pressure of pure $C S_{2}$ is 850 torr. A solution of 2.0 g of sulphur in 100 g of $C S_{2}$ has a vapour pressure 844.9 trr. Determine the atomicity of sulphur molecule:

A

1

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B

2

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C

4

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D

8

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Solution

The correct option is D 8
(d) $\frac{P^{\circ} - P}{P} = \frac{n}{N} \Rightarrow \frac{W}{W \times N}$
$\Rightarrow \frac{850 - 844.9}{844.9} = \frac{2 \times 76}{M \times 100}$

$M \approx 252; n = \frac{252}{32} \approx 8$
$∴$ atomicity of sulphur is $8$

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