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Chemistry
What is the percentage of free space in fcc and bcc?
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Q. What is the percentage of free space in $fcc$ and $bcc$?
UP CPMT
UP CPMT 2015
The Solid State
A
$32\%$ and $68\%$
7%
B
$68\%$ and $32\%$
9%
C
$26\%$ and $32\%$
77%
D
$32\%$ and $26\%$
6%
Solution:
Packing fraction of fcc $= 74\%$
Empty space $= 100 - 74 = 26\%$
Packing fraction of bcc $= 68\%$
Empty space $= 100 - 68 = 32\%$