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NEET2016ChemistrySolid StateActual

Lithium has a bcc structure. Its density is 530   k g   m - 3 and its atomic mass is 6.94   g   m o l - 1 . Calculated the edge length of a unit cell of Lithium metal. N A = 6.02 × 10 23   m o l - 1

Options

  1. A154 pm
  2. B352 pm
  3. C527 pm
  4. D264 pm

Correct answer

B. 352 pm

Step-by-step solution

d = Z   M N A   a 3 a 3 = 6.94 × 2 6.022 × 10 23 × 530 × 10 - 3 = 6.94 × 200 × 10 - 24 5.30 × 6.022 = 3.52 × 10 - 8   c m = 352   p m

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