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The number of unit cells present in 39 g of potassium if it crystallizes as body centred cube is ( N = Avogadro number, At. Wt. of potassium = 39 g/mol )

Options

  1. AN 4
  2. BN 2
  3. CN 3
  4. DN

Correct answer

B. N 2

Step-by-step solution

Potassium has bcc system Number of mole = 39/39 = 1 mole 1 mole of atoms = 6 .022 × 10 23 atoms = N ∵ In bcc system 2 atoms are present in 1 unit cell. ∴   N number of atoms are present in N 2 unit cells.

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