Number of atoms present in a FCC unit are four.
Density of face-centered cubic unit cell=A3×Na4×M
M=molar mass of xenon=131.293g
A= edge of unit cell=22r=2×2×186.9×10−12=3.8668×10−3cm
Na= Avogadro's number=6.02×1023
In this case, density of xenon=(3.8668×10−3)3×6.02×1023cm34×131.293g=(3.4806×1016cm3)525.172g=1.5089×10−14g/cm3
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