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Chromium crystallizes in a body centred ...

Chromium crystallizes in a body centred cubic lattice, whose density is 7.20 `g//cm^3`. The length of the edge of unit cell is 288.4 pm. Calculate Avogadro's number.
(Atomic mass of chromium=52)

Text Solution

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For bcc, Z=2 , `rho=7.2 "g/cm"^3`
a=288.4 pm or (`288.4xx10^(-10)`) cm
A=52
`N_0`=?
`N_0=(ZxxA)/(rhoxxa^3)=(2xx52)/(7.2xx(288.4xx10^(-10))^3)`
`N_0=6.02xx10^23` atoms
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