Given that
Length of edge, a=3.61×10–8cm
Atomic mass of cupper, M=63.55g/mol
Avogadro constant,NA=6.022×1023permol
Number of atoms in unit cell ofFCC,Z=4
Use formula of density-
p=ZMa3NA
Plug the values in this formula we get-
p=8.92gm/cm3