The density of chromium is 7.2 gm cm. And crystallises in a body centered cu ic lattice with edge length 290 pm. The num of atoms present in 30.0 gm of the sample.

Dear Student,
d= 7.2 gm/cm3, a=290 pm 
Bcc lattice so Z=2  , m=3 gm
d=Z×ma3×NA
7.2=2×3(298×10-10)3×N
N=2×37.2×(298×10-10)3
number of atoms or N = 3.14×1022
 

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