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How many unit cells are present in a cube shaped ideal crystal of NaCl of mass 1 g?

a. 5.14 x 1021

b. 1.28 x 1021

c. 1.771 x 1021

d. 2.57 x 1021

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d. 2.57 x 1021

Mass of the unit cell = Number of formula units in unit cell x mass of each formula unit

4x \(\frac{58.5}{N_A}\) g of NaCl contains = 1 unit cell

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