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.

m = 6000 grams

Calculate density

ρ = 2 g/mL