• Density is a physical property of matter, as each
element and compound has a unique density
associated with it.
• In a qualitative manner, it is defined as the measure
of the relative “heaviness” of objects with a constant
volume
• Density may also refer to how closely “packed” or
“crowded” the material appears to be
• The formal definition of density is mass per unit of volume
• Usually density is expressed in grams per mL or cc
• CC is cubic centimeter which is equal to a mL
• Per statement is translated to division
Density = mass = g/mL
volume
Example 1:
Calculate the density in g/mL of aluminum if a 50 mL block
weighs135 g.
Solution:
Apply the Definition
Density = 135 g = 2.70 g/mL
50 mL
Solving for Density:
D= M
V
Solving for Mass:
M=VxD
Solving for Volume:
V=M
D
Example 2:
Iron has a density of 7.87 g/cm3 . What is the mass of 250 cm3 of
iron?
Solution:
Apply the Definition
7.87 g/cm3 = _M__
250 cm3
 7.87 g/cm3 x 250 cm3 = 1967.50 g
1. A piece of metal has a mass of 45.6 grams and a volume of 110 cm3 . What is its
density?
2. Aluminum has a density of 2.70 g/cm3 . What is the mass of a cube of
aluminum that measures 9.3 cm on a side?
3. If a block of wood has a density of 0.6g/cm3 and a mass of 120g, what is its
volume?
4. If you have a gold brick that is 2cm by 3cm by 4cm and has a density of
19.3g/cm3, what is its mass?