Question

If the mass of a material is 78 grams and the volume of the material is 23 cm3, what would the density of the material be?

Answer 1

Density = mass / volume

Density = (78g) / (23cm^3)

Density = 3.4g/cm^3

Answer 2

By definition, density is mass per volume.

$d=\frac{m}{v}$

Plugging in the given values gives:

$d=\frac{78 g}{23 cm^3} =3.3913\frac{g}{cm^3}$

The only operation done in the problem is division, and both numbers have 2 significant figures, so this would be $3.4\frac{g}{cm^3}$ with correct significant figures.