A wellknown mineral flourite is chemicallycalciumfloride.itis knownthat in one unit cell of this mineral there are 4ca2+ ions and 8fnegative ions and that ca2+ions are arrangedin a fcc lattice.The f_ions fill all the tetrahedral holesin fcc latticeof ca2+ions.The edge length if unitcell is 5.46×10^-8 cm in length.Thedensity of the.solid is 3.18gcm-3 .use thus information to calculate Avogadro;s number.(molarmass of caF2=78.8)
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