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How many unit cells are present in a cubeshaped ideal crystal of NaCl of mass 1.00 ~g ? [Atomic masses: Na =23, Cl =35.5 ]

Options

  1. A5.14 10²¹ unit cells
  2. B1.28 10²¹ unit cells
  3. C1.71 10²¹ unit cells
  4. D2.57 10²¹ unit cells

Correct answer

D. 2.57 10²¹ unit cells

Step-by-step solution

Number of formulas in cube shaped crystals = 1.0 58.5 6.02 10²³ since in NaCl type of structure 4 formula units form a cell unit cells = 1.0 6.02 10²³ 58.5 4 =2.57 10²¹ unit cells.

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