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10 April, 00:35

Lead β is a solid phase of lead still unknown to science. The only difference between it and ordinary lead is that Lead β forms a crystal with a bcc unit cell and a lattice constant (7-404. pm). Calculate the density of Lead β Round your answer to 3 significant digits cm

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  1. 10 April, 03:20
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    Density is : 10.4 g/cm³

    Explanation:

    Here a = 404.0 pm

    a = 4.04*10^-8 cm

    Molar mass = 207.2 g/mol

    since the cubic cell is Body Centered Cubic, the value of Z=2

    d = (Z*M) / (a^3*NA)

    d = (2*207.2) / ((4.04*10^-8) ^3 * (6.022*10^23))

    d = 10.436 g/cm^3

    Answer: 10.4 g/cm^3
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