Question

18. Copper has density 9.89 g/m^3 2 points
and atomic weight is 63.5 g/mole if
its lattice constant is 3.5 AU.Which
cubic crystal structure copper
belongs?​

Answer 1

Explanation:

Mass of one atom of copper =

Avogadro’s number

Molar mass of copper

=

6.023×10

23

63.5

=1.054×10

−22

g

Mass of the unit cell =4×1.054×10

−22

g

Volume of the unit cell =

Density

Mass of copper

=

8.95

4×1.054×10

−22

=4.71×10

−23

cm

3

Volume of unit cell =8

8

r

3

Hence, r

3

=

8

8

4.71×10

−23

=2.07×10

−24

cm

3

Hence, the radius of copper atom is 1.28×10

−8

cm.

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