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When heated above 916^(@)C, iron cha...

When heated above `916^(@)C`, iron changes its bcc crystalline from to fcc without the change in the radius of atom . The ratio of density of the crystal before heating and after heating is :

Text Solution

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In body-centred packing, the efficiency of packing is `67.92%` . In the cubic packing, the packing efficiency is 74.02%.
Let `rho_(1)` be the density when packing efficiency is 74.02% and `rho_(2)` is the density when packing efficiency is 67.92%
`(rho_(2))/(rho_(1))=(67.92)/(74.02)=0.918`
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