Question

(3) Tonic Uc
Lithium metal has a body centred cubic structure.
its density is 0.53 g cm and its molar mass is
6.94 g mot Calculate the edge length of a unit
cell of Lithium metal
(1) 153.6 pm
(2) 351.6 pm
(3) 527.4 pm
(4) 263.7 pm
what is the correct option?​

Answer 1

answer

(2) 351.6

Explanation:

Given, z=2,d=0.53gcm

−3

Molar mass m=6.94

⇒a

3

=

dN

A

ZM

⇒a

3

=

0.53×6.022×10

23

2×6.94

⇒a

3

=4.38×10

−23

⇒a=0.3516×10

−7

cm≃351.6pm

Hence, edge of unit cell is 351.6pm.