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Question

If we have a FeSO4.7H2O sample and it contains a total of 2233 oxygen atoms, then find the number of formula units of FeSO4.7H2O present in the sample.

A
210
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B
203
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C
103
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D
233
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Solution

The correct option is B 203
1 mole of FeSO4.7H2O contains 11 moles of O-atoms.
So, 11 moles of O-atoms are present in 1 mole of FeSO4.7H2O.
Again, 6.022×1023 O-atoms = 1 mole of O-atoms.
Therefore, 2233 O-atoms =22336.022 × 1023 moles of O-atoms.
Hence, the number of formula units of FeSO4.7H2O present in the sample
=22336.022 × 1023×111×6.022×1023=203

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