Sample Problem 1.5
Calculating Density from Mass and Length
PLAN:
Density is expressed in g/cm3 so we need the mass in grams and the volume in cm3.
mass (mg) of Li
lengths (mm) of sides
mass (g) of Li
density (g/cm3) of Li
lengths (cm) of sides
volume (cm3)
SOLUTION:
20.9 mm x
= 1.49 g
1.49x103 mg x
= 2.09 cm
Similarly the other sides will be 1.11 cm and 1.20 cm, respectively.
2.09 x 1.11 x 1.20 = 2.76 cm3
density of Li =
= 0.540 g/cm3
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