6) What is the density of NaCl given that and rci = 181pm. Show your calculations below. rNa+ = 102pm Hint: Edge length of an unit cell of NaCl, d = 2rcr + 2rNa*, Volume = d³ Mass of NaCl unit cell = (58.54g/formula unit) x (# of 'units of NaCl’ in a unit cell) 6.022 x 1023 units/ formula unit Density = mass/volume

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Crystal Structures

Solids are present all around us. They have different properties and applications. Diamond and graphite are two well-known solids. Diamond is the hardest material in the world and is used in making jewelry. Graphite on the other hand is soft. The lead of your pencil is graphite. Why are they so different in appearance and properties despite the fact they are chemically the same? Both are allotropes of carbon. The answer lies in the structure, the way constituent particles are arranged in the solids.