Question

Barium metal (d = 3. 51 g/cm³) has a body-centered cubic structure. Calculate the edge length of a unit cell. (1 m = 10¹² pm).

Answer 1

The edge length of a unit cell of the Barium metal is; 3.01cm

Density, Mass and Volume

The mass number of one mole of barium metal is; 137 g.

On this note, the volume of a unit cell of Bromine metal can be obtained from the relation;

• Volume = Mass/density = 137/3.5 = 27.4 cm³.

On this note, the edge length of a unit cell can be evaluated as follows;

• Volume = length³

• Length = ³√27.4

• Length = 3.01cm

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