Question

copper crystal has a face centred cubic lattice structure. its density is 8.93g/cm^-3. what is the edge length of the unit cell ? atomic mass of copper M =63.5gmol^-1
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Answer 1

Given d=8.966 g/cm

Molar mass of copper =63.5 g/mol

N

A

=6.022×10

23

d=

V×N

A

Z×M

where Z=4 (For FCC)

V=

d×N

A

Z×M

V=

8.966×6.023×10

23

4×63.5

V=4.704×10

−23

cm

3