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Question

Find the number of formula units of FeSO4.7H2O present in 11 millimoles of FeSO4.7H2O.


A
0.011NA
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B
0.11NA
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C
1.1 NA
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D
11 NA
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Solution

The correct option is A 0.011NA
Number of formula units =number of moles×NAformula units/mol
11 millimoles=11×103moles or 0.011moles
Number of formula units =0.011×NA

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