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  4. The mass of unit cell of CaF2 (fluorite structure) corresponds to

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Q. The mass of unit cell of $CaF_2$ (fluorite structure) corresponds to

The Solid State

Solution:

In $CaF_2$ (calcium fluorite) structure $1$-unit cell contains $4 -Ca^{2+}$ ions and $8 F^-$ ions.
So, mass of unit cell of $CaF_2$
= mass of $4 Ca^{2+}$ ions + mass of $8F^-$ ions