PreLab Experiment 11

PreLab Experiment 11 - fraction of the unit cell volume...

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Andrew T. Hedrick Chem 32 Section S Experiment 11 – Crystal Models of Metals and Ionic Compounds Prelaboratory Questions 1. Diamond crystallizes in a cubic unit cell with  a  = .35670nm and Z=8. Using 3.51g/ cm 3  as the density of a diamond, calculate the value of Avogadro’s number. 2. In the primitive cubic unit cell, the volume actually occupied by the one atom is  (4/3) R 3 . Using the relationship between  a  and R for this unit cell, show that the 
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Unformatted text preview: fraction of the unit cell volume actually occupied by the atom is just slightly greater than one-half. 3. The ionic radius of the Ca 2+ cation is .099nm and of the O 2- anion is .140nm. Calculate r + /r- for CaO, and describe the hole geometry and predict the fraction of these holes that must be filled by cations in order to justify the empirical formula. Andrew T. Hedrick Chem 32 Section S...
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PreLab Experiment 11 - fraction of the unit cell volume...

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