p42 001

background image

1. The number of atoms per unit volume is given by n = d/M , where d is the mass density of copper and

M is the mass of a single copper atom. Since each atom contributes one conduction electron, n is also
the number of conduction electrons per unit volume. Since the molar mass of copper is A = 63.54 g/mol,
M = A/N

A

= ( 63.54 g/mol)/(6.022

× 10

23

mol

1

) = 1.055

× 10

22

g. Thus,

n =

8.96 g/cm

3

1.055

× 10

22

g

= 8.49

× 10

22

cm

3

= 8.49

× 10

28

m

3

.


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