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

Question

Chemistry

Cornelius Jarvis

3 December, 12:37

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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Jean Daugherty · Answer 1

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