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CBSE Class 12-science Answered

Li metal has a body centred cubic structure. its density is 0.53g/cmcube & its molar mass is 6.94g/mol. calculate the edge length of the unit cell of lithium metal?(without using iog table)

Asked by yadav.ml | 27 Apr, 2014, 08:39: PM
answered-by-expert Expert 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  6.94g/mol

                    a3  X 6.022 X 1023mol-1

a3 = 4.34 X 10-23

a = 0.351 X 10-7cm

Answered by | 30 Apr, 2014, 10:19: AM

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