. The well known mineral fluorite is chemically calcium fluoride


The well known mineral fluorite is chemically calcium fluoride. It is known that in one unit cell of this mineral there are 4 Ca2+ ions and 8 F ions and that Ca2+ ions are arranged in a fcc lattice. The F ions fill all the tetrahedral holes in the face centred cubic lattice of Ca2+ ions. The edge of the unit cell is 5.46 × 10–8 cm in length. The density of the solid is 3.18 g cm–3. Use this information to calculate Avogadro's number (Molar mass of CaF2 = 78.08 g mol–1)

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chemically calcium fluoride

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