Question

How many unit cells are there in 1 gm cube shaped ideal crystal?

Answer 1

Answer:

2.57 x 10^21 units.

Explanation:

One unit cell of NaCl contains 4 NaCl units (ie) has mass

Number of unit cell present in a cube shaped crystal of NaCl of mass 1 g = m×Na(M×Z)m×Na(M×Z)

Hence Z = 4

Molecular Weight of NaCl (M) = 58.5

m = 1.00 g

Na=6.023×1023Na=6.023×1023

Hence substitute the value in the above equation We get

No. of unit cell in 1g =1×6.02×10234×58.51×6.02×10234×58.5

=2.57×1021.

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