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Sagot :
The Avogadro' s number is 6.022×10²³
What is body centered cubic lattice?
The Bravis lattice of the same name serves as the basis for the BCC crystal structure, which has one atom per lattice point at each of the cube's four corners and in its centre. BCC's high proportion of nearest and next-nearest neighbours contributes to its tight proximity and excellent stability.
atomic mass of Ba = 137.327u
No. of atoms of Ba in a BCC unit cell = 2
Edge length of unit cell= 502pm =502ₓ10⁻¹⁰ cm
density =3.50g/cm³
ρ=ZM/N₀ₓV
3.50=2ₓ137.327/N₀ₓ(502ₓ10⁻¹⁰)³
=78.47257/1.265ₓ10⁻²²
N₀=6.02ₓ10²³
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