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The number of unit cells in 58 .5 g of N a C l is approximately

Options

  1. A6 × 1 0 20
  2. B1.5 × 1 0 23
  3. C6 × 1 0 23
  4. D0.5 × 1 0 24

Correct answer

B. 1.5 × 1 0 23

Step-by-step solution

58 .5 g N a C l = 6 × 1 0 23 molecule (atoms) of N a C l (as N a C l occupies FCC system) 1-unit cell have 4 molecules of N a C l So, no. of unit cell = 6 × 1 0 23 4 = 1.5 × 1 0 23

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