NEET | 2016Solid StateHard

Question

Lithium has a bcc structure. Its density is 530 kg m-3 and its atomic mass is 6.94 g mol-1. Calculated the edge length of a unit cell of Lithium metal. (NA = 6.02 × 1023 mol-1)

Options

A.

154 pm

B.

352 pm

C.

527 pm

D.

264 pm

Solution

D=Z MNA a3
a3 =6.94×26.022×1023×530×10-3=6.94×200×10-245.30×6.022
= 3.52 × 10-8 cm
= 352 pm

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