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MHT CET202014 Oct 2020Morning ShiftChemistrySolid StateActual

What is the number of atoms present per unit cell of aluminium having edge length 4 ~A ^ ? (If density of Al =2 7 ~g ~cm ⁻³ , At. mass of Al =27 )

Options

  1. A8
  2. B1
  3. C2
  4. D4

Correct answer

D. 4

Step-by-step solution

a =4 Å=4 10⁻⁸ ~cm , =2.7 ~g ~cm ⁻³ M =27, n =? n = a ³ N _ A M = 2.7 (4 10⁻⁸ )³ 6.022 10²³ 27 =3.85 4

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