Density is the measurement of the amount of mass per unit volume. Density calculations are done using the formula:

where ρ = density m = mass V = volume

Example Problems: 1. Calculate the density in g/mL of 30 mL of solution that weighs 120 grams. 2. Calculate the density in g/mL of 0.4 L of solution weighing 150 grams. 3. Calculate the density in g/mL of 3000 mL of solution weighing 6 kg.

Example 1

density = 4 g/mL

Example 2 We want to know the density in g/mL, but our volume is in liters. First, convert the volume to mL.

V= 400 mL

Now we can calculate the density

ρ = 0.375 g/mL

Example 3 Again, we want g/mL, and our mass is in kg. Convert the mass to grams.