If we have a CuSO4.5H2O sample and it contains a total of 1116 oxygen atoms, find the number of formula units of CuSO4.5H2O present in the sample.
A
124
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B
9NA
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C
0.124NA
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D
279
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Solution
The correct option is A 124 One formula unit of CuSO4.5H2O has 9 oxygen atoms.
So, 1116 oxygen atoms will be present in =11169 formula units of CuSO4.5H2O = 124 formula units of CuSO4.5H2O