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21 March, 08:40

What is the density of iridium metal? (Ir: 192.2 g/mol; face-centered cubic with 3.83x10^-8 cm edges).

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  1. 21 March, 09:01
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    Number of atoms in FCC repeat structure: 5

    Mass of one atom of Ir:

    192.2 / 6.02 x 10²³

    = 1.60 x 10⁻²¹ g

    Volume = (3.83 x 10⁻⁸) ³ cm³

    density = (1.60 x 10⁻²¹ x 5) / (3.83 x 10⁻⁸) ³

    = 28.4 g cm⁻³
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