A cube of gold (Au) has a side length of 1.55 cm. If the sample is found to have a mass of 71.9 g, how do you find the density of Au?

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Answer 1 · 2016-08-31T12:37:26

It is easy to find the density of gold by using a simple formula.

The density of any substance is mass/volume.

$ρ = m/V$

The volume of a cube is

$V=l^3$

where $l$ is the length of an edge.

$V = ("1.55 cm")^3 = "3.72 cm"^3$

∴ $ρ = "71.9 g"/"3.72 cm"^3 = "19.3 g/cm"^3$