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A metallic element exists in cubic lattice. Each edge of unit cell is 4 A o The density of metal is 6 .25 g /m 3 . How many unit cells will be present in 100 g of metal?

Options

  1. A1 × 1 0 22
  2. B2.5 × 1 0 29
  3. C5 × 1 0 23
  4. D2 × 1 0 23

Correct answer

B. 2.5 × 1 0 29

Step-by-step solution

d = weight Total volume 6.25 = 100 n × 4 × 10 − 10 3 100 6.25 × 64 × 10 − 30 n   =   2 .5   ×   10 29

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