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Density Worked Example Problem

Calculating Density of a Substance

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Density is mass per unit volume of a solid, liquid, or gas.

Density is mass per unit volume of a solid, liquid, or gas.

Arne Pastoor, Getty Images
This is a worked example of how to calculate the density when given the volume and mass of a substance.

Problem:

A brick of salt measuring 10.0 cm x 10.0 cm x 2.0 cm weighs 433 grams. What is its density?

Solution:

Density is the amount of mass per unit volume, or:
Density = mass/Volume

Step 1: Calculate Volume

Volume = length x width x thickness
Volume = 10.0 cm x 10.0 cm x 2.0 cm
Volume = 200.0 cm3

Step 2: Determine density

Density = mass/Volume
Density = 433 g/200.0 cm3
Density = 2.165 g/cm3

Answer:

The density of the salt brick is 2.165 g/cm3.

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