(a) How many ion-pairs are present in a unit cell of NaCI?
(b) A unit cell length of 564 pm for NaCI has been determined by X-ray diffraction studies. Determine the volume of a unit cell of NaCI.
(c) Using the data from pail (b), determine the density of NaCI.
(d) By comparing your answer to with an observed density of 2.17 g cm -3 confirm that the structure of NaCI is free of defects.
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