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Sodium (atomic mass = 23) forms face-cen...

Sodium (atomic mass = 23) forms face-centred cubic crystal. What is the density of sodium crystal if the radius of sodium atom is 1.91Å?

Text Solution

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`rho=(ZxxM)/(a^(3)xxN),Z=4,a=rxx2sqrt2=5.4xx10^(-8)cm`
`thereforerho=(4xx23)/((5.4xx10^(-8))^(-3)xx6.022xx10^(23))g*cm^(-3)`
`=0.97g*cm^(-3)`
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