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Q 2641578423.     The well known mineral fluorite is chemically calcium fluoride. It is known that in one unit cell of this mineral, there are 4 Ca^(2+) ions and 8 F^- ions and that Ca^(2+) ions are arranged in fcc lattice. The F^- ions fill all the tetrahedral holes in the face centred cubic lattice of Ca^(2+) ions. The edge of the unit cell is 5.46 xx 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 CaF_2 = 78.08 g mol^-1)

CBSE-12th 2010

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