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9 November, 17:49

Strontium (Sr) has the FCC crystal structure, an atomic radius of 0.215 nm, and an atomic weight of 87.62 g/mol. What is its theoretical density?

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  1. 9 November, 18:02
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    Answer:Theoretical density = 2.576g/cm³

    Explanation:

    Theoretical density p = (A*n) / Vc * Av

    A = molecular weight

    n = effective number of atoms per unit cell

    Vc=Volume of unit cell = a³

    Av = Avogadro's constant = 6.02*10²³

    Given that A = 87.2g/mol

    n = 4 (For FCC crystal structure)

    Vc = a³

    Where a = 2R√2 and R is the atomic radius

    R=0.215

    a = 2 * 0.215*√2

    a = 0.608nm = 0.608*10^-7 cm

    Vc = (0.608*10^-7 cm) ³

    Vc=2.25*10^-22 cm³

    P = (87.2 * 4) /

    (2.25*10^-22) * (6.02*10²³)

    P = 2.576g/cm³

    Therefore the theoretical density of strontium is 2.576g/cm³
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