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Dear shefali
volume of the unit cell = abc =6.8*4.4*7.2 =215.424 A3 = 2.154 *10-22 cc
each unit cell has 4 molecules so mass of each unit cee = 4*21.76/(6.023 *1023)
=1.445 * 10-22 gm
so density =1.445 * 10-22 gm/2.154 *10-22 cc
=.671 gm/cc
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