In one unit cell of CaF2 there are 4 Ca 2+ ions and 8 F- ions and that Ca 2+ ions are arranged in an fcc lattice . The F- ions  fill all the tetrahedral voids in fcc of Ca 2+ ions . The edge length of this unit cell is 5. 46 x 10 -8 cm 3. The density of the solid is 3.18 g /cm3 . Calculate the NA , using the information . Mol.w t of CaF2 = 78.08 g /mol                                                    

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