How many molecules are there in the unit cell of sodium chloride 

How many molecules are there in the unit cell of sodium chloride 

  1. A

    2

  2. B

    4

  3. C

    6

  4. D

    8

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    Solution:

    In NaCl (rock salt) : 

    Number of Na+ ions = 12(at edge centers) x14+1(at body centre)x1=4.

    Number of Cl- ions =8(at corners)x18+6(at face centre)x12=4.

    Thus 4 formula units per unit cell. ex=NaNO3, CaSO4, calcite CaCO3, HgS

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