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Valence Bond Theory

9.0 g water i...

Question

$9.0$ g water is added into oleum sample labelled as $1127 %$ $H_{2} {S O}_{4}$ . The volume of free ${S O}_{3}$ remaining in the solution is :

A

14.93

L at STP

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B

7.46

L at STP

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C

3.73

L at STP

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D

11.2

L at STP

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Solution

The correct option is D $3.73$ L at STP
The oleum sample is labelled as $112 %$ $H_{2} S O_{4}$ .
$9$ g water is added. Hence, $12 - 9 = 3$ g water is yet to be added.
This corresponds to $\frac{3}{18} = 0.167$ mol water to be added.
This corresponds to $0.167$ moles of free $S O_{3}$ which occupies a volume of $22.4 \times 0.167 = 3.73$ L at STP.

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