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Question

A sample of AlF3 contains 9.012×1023 F ions. The volume occupied by the AlF3 sample at STP is:

A
22.4 L
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B
11.2 L
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C
5.6 L
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D
17.8 L
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Solution

The correct option is B 11.2 L
3 F ions are present in a molecule of AlF3.

The number of molecules of AlF3 that contain 9.036×1023 Fions= 1×9.036×10233

Number of moles =1×9.036×10233×6.023×1023=0.5 mol
Volume of AlF3 occupied at STP =0.5×22.4 = 11.2 L

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