Density is the measure of the amount of mass per unit volume. Density calculations are performed using the formula:
where
ρ = density
m = mass
V = volume
Example problems:
1. Calculate the density in g / mL of 30 mL of solution weighing 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 litres. 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
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