Question

Chromium metal crystallizes with a body centred cubic
lattice. The length of unit cell is found to be 287 pm.
Calculate the atomic radius ,the number of atoms
per unit cell and the density of chromium. Atomic mass of Cr=52 gmol ^-1 and N°=6.02×10^23 mol ^-1​

Answer 1

Answer: Here are the answers!!!

Explanation:

Answer 2

Answer:

For bcc lattice, r=

3

×

4

a

=

4

3

×287

Explanation:

Now Density =n×

V

at.wt.

×Av.No.=n×

a

3

at.wt.

×Av.No.

N=2 for bcc; a=287×10

−10

cm

So,

Density =2×

(287×10

−10

)

3

51.99

×6.023×10

23

=7.30 g/ml

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