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Question

9.0 g water is added into oleum sample labelled as 1127% H2SO4. The volume of free SO3 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% H2SO4.
9 g water is added. Hence, 129=3 g water is yet to be added.
This corresponds to 318=0.167 mol water to be added.
This corresponds to 0.167 moles of free SO3 which occupies a volume of 22.4×0.167=3.73 L at STP.

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