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Question

The density of CaF2 (fluorite structure) is 3.18 g/cm3. The length of the side of the unit cell is:

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Solution

Density of CaF2=3.18

Molar Mass of CaF2=78g/mol.

Using the Formula,

Density=MassVolume.

Volume=MassDensity

Volume=783.18

Volume=24.53 cubic units.

Now, Volume of one cube of CaF2=(Side)3

Side=3Volume

Side=324.53

Side=2.905units.

Hence, the Length of the side of the unit cell of the CaF2is2.905units.


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