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AP EAMCET2011ChemistrySolid State

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 )

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 10²³ 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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