Question

lithium metal has a bcc structure .its density is 0.53g and its molar mass is 6.94g calcalute the edge length of unit cell of lithium​

Answer 1

Answer:

Solution:

For the bcc structure, Z = 2

Edge of unit cell , a = ?

Density of the element,r = 0.53 g/cm3

r = Z  X  M / a3  X N0

0.53g/cm3 = 2 X  6.94gmol  /a3  X 6.022 X 1023mol-1

a3 = 4.34 X 10-23

a = 0.351 X 10-7cm

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