Question

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?

Answer 1

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

hope it help you