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Potassium crystallises in a body centred cubic unit cell. The mass of one unit cell is

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1.29×10^–24 gm

$1.295 \times 10^{- 22} gm$

$1.29 \times 10^{- 23} gm$

6.2×10^–23 gm

answer is B.

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Detailed Solution

Z=2 for body centred cubic unit cell.

Molecular weight of unit cell =39×2=78 amu

78 amu=1.29×10⁻²³ gm (1 amu=1.6726×10⁻²⁴ gm)

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