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Question

Calculate the number of FeSO4.7H2O formula units in 0.5 millimoles of pure FeSO4.7H2O.

A
0.5 NA
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B
0.0005 NA
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C
0.005 NA
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D
5000 NA
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Solution

The correct option is B 0.0005 NA
1 millimole =103 moles

1 mole of pure FeSO4.7H2O contains NA number of formula units of FeSO4.7H2O.

The number of formula units of pure FeSO4.7H2O in 0.5 millimoles will be
=0.5×103NA
=0.0005 NA

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