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1.The well known mineral fluorite is chemically calcium fluoride. It is known that in one unit cell of it has 4 Ca²+ and 8F- and Ca²+ are arranged in F.C.C. lattice. F- ions fill all the tetrahedral voids in F.C.C. unit cell of Ca²+. The edge of unit cell is 5.40 × 10-8 cm. The density of the solid is 3.18g/cc. Calculate Avogadro number.

Answer» 1.The well known mineral fluorite is chemically calcium fluoride. It is known that in one unit cell of it has 4 Ca²+ and 8F- and Ca²+ are arranged in F.C.C. lattice. F- ions fill all the tetrahedral voids in F.C.C. unit cell of Ca²+. The edge of unit cell is 5.40 × 10-8 cm. The density of the solid is 3.18g/cc. Calculate Avogadro number.


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