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Question 15

Copper crystallises into a fcc lattice with edge length 3.61 x 10-8cm. Show that the calculated density is in agreement with its measured value of 8.92 g cm-3.

Answer

In fcc lattice Z= 4

Atomic mass M = 63.5

a = 3.61x10-8

Therefore from the formula density = ZxM/a3 x N0

We get density = 4x 63.5/3.61x10-8 x 6.022 x1023

= 8.96 gcm-3.

The value is approximately equal to 8.92.

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