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​​a metal M crystallizes in FCC and BCC structures depending on temperature .the ratio of its densities in fcc and bcc structures would be ?

Kindly refer to the link given below:

https://www.meritnation.com/ask-answer/question/if-a-crystal-changes-from-fcc-to-bcc-then-calculate-the-r/the-solid-state/4559024

  • -6
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For the FCC structure Z1=4 and
BCC structure, Z2=2
Volume is V and Atomic mass is M.
Density of the element=(mz)/(N0a3),
as m , N0​ and a 
are same for same metal (and N0 is a constant)
We get ,
ρ1:ρ2=Z1:Z2=4:2=2:1
Hence, the ratio of densities of
FCC to BCC is 2:1
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