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In orthorhombic unit cell the value of a, b and c are respectively 4 .2 Å, 8 .6 Å and 8 .3 Å . Given the molecular mass of the solute is 155 g m o l - 1 and density is 3 .3 g/cc , the number of formula units per unit cell is (Report your answer by rounding up to nearest integer)

Options

  1. A2
  2. B3
  3. C4
  4. D6

Correct answer

C. 4

Step-by-step solution

Z = V × N A × ρ M V = Volume of unit cell = a × b × c = 4.2 × 8.6 × 8.3 × 10 - 24 × 6.023 × 10 23 × 3.3 155 = 3.84 ≃ 4

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