1. Warm-Up
Perform the following calculations and write your answer with the proper number of sig figs.
(1.79 g) / (3.7 mL) =
(432.0 cm) x (120 cm) =
(2 cm) x ( cm) =
cm cm =
m m =

2. DENSITY

3. Density Density is a substance’s mass divided by its volume
In SI units, density is expressed in kg/m3
We commonly express it differently:
Solids: g/cm3
Liquids: g/mL
Gases: g/L

4. Density Values
When we express the density of a gas, we must include a temperature
The density of a material can be determined by measuring the mass and volume of a sample of any size!
Densities are constant values. They remain the same at constant temperature.
Ex: Density of water is 1.00 g/mL

5. Practice Problem 1
A piece of beeswax with a volume of 8.50 cm3 is found to have a mass of 8.06 g. What is its density?

6. Practice Problem 2
Cobalt has a density of 8.90 g/cm3. What volume would 17.8 g of cobalt have?

7. Practice Problem 3
What is the mass of 19.9 cm3 of coal, which has a density of 1.50 g/cm3?