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Question

How many unit cells are present in 16.0 gm of crystal AB (formula mass of AB=40) having rock salt type structure.

[NA=Avogadro's no.]

A
NA
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B
0.1 NA
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C
0.4 NA
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D
0.5 NA
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Solution

The correct option is B 0.1 NA
In rock salt type structure there are 4 AB molecules in one unit cell.

In 16.0g of crystal AB there are 1640×NA molecules and 1640×NA×14 unit cells.

So, the number of unit cells is 0.1×NA.

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