# 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?

Aug 31, 2016

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

#### Explanation:

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