The density of KBr is 2.75g cm^(-3). The...

The density of KBr is 2.75g `cm^(-3)`. The length of the edge of the unit cell is 654 pm. Show that KBr has a face centred cubic structure.(`N_A=6.023xx10^(23) mol^(-)` at. mass : K=39, Br = 80]

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d=2.75g `cm^(-3)`, a=654 pm, `N_A = 6.023 xx 10^(23)`, M = 39+80= 119 g `mol^(-1)`, Z=?, `d = (ZM)/(N_A xx a^3)` or `Z = (d xx N_A xx a^3)/(M) =(2.75 xx 6.023 xx 10^(23) xx (654 xx 10^(-10))^3)/(119) = 3.89 ~~ 4`
Since Z=4, KBr has a fcc structure.

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The density of KBr is 2.75g `cm^(-3)`. The length of the edge of the unit cell is 654 pm. Show that KBr has a face centred cubic structure.(`N_A=6.023xx10^(23) mol^(-)` at. mass : K=39, Br = 80]

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