Cu metal crystallises in face centred cubic lattice with cell edge, a=361.6pm. What is the density of Cu crystal? (Atomic mass of copper =63.5amu,NA=6.023×1023).
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Solution
Z=a3×ρ×NAM ∴ρ=ZMa3NA Z=4 for fcc unit cell; M=63.5gmol−1 a=361.6×10−10cm;NA=6.023×1023 ρ=4×63.5(361.6×10−10)3×6.023×1023=8.94gcm−3.