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At room temperature, sodium crystallises in a body centred cubic cell with a = 4.24 Å.The theoretical density of sodium is –( Atomic mass of sodium = 23.0 g mol^(–1)) (A) 2.05 g cm^(–3) (B) 3.45 g cm^(–3) (C) 1.00 g cm^(–3) (D) 3.55 g cm^(–3) |
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Answer» Solution : (C ) The value of Z for a bcc unit cell is 2. VOLUMEV= `(4.24 A)^(3) THEREFORE =(ZM)/(NV)=(2xx23)/((6.023xx10^(23))xx(4.24xx10^(-8))^(3)` =1.00 `g//cm^(3)` |
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