Question

Number of unit cells in 4 g of X (Atomic mass = 40) which crystallises in bcc pattern is (NA = Avogadro number)

a) 0.1 NA
b) 0.2 NA
c) Na/20
d) 2 NA​

Answer 1

Answer:

Given that,

Atomic mass X=40

Now,

No of atoms unit cell for bcc z=2

No of atoms in 4g

=

40g 4g ×N A

=0.1×N A atoms

Now, no of unit cells= 2

0.1×N A unitcell

Hence, this required solution.

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Answer 2

Answer:

Given that,

Atomic mass X=40

Now,

No of atoms unit cell for bcc z=2

No of atoms in 4g

$\frac{4g}{40g} \times na$

$0.1 \times na \: atoms$

Now, no of unit cells =2

$\frac{0.1 \times na}{2} unit \: cell$

Hence, this required solution

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