Density: Mass, Volume, g/mL

Density formula

Density = mass ÷ volume (d = m/V)

Volume from density

Volume = mass ÷ density (V = m/d)

Mass from density

Mass = density × volume (m = d × V)

What unit does density usually have?

grams per milliliter (g/mL)

How do you know the final unit in a density problem?

The unit comes from what the question asks for (mass → g, volume → mL)

If the question asks for volume, what unit must the answer be?

milliliters (mL)

If the question asks for mass, what unit must the answer be?

grams (g)

Operation when given mass and density but asked for volume

Divide: mass ÷ density

Operation when given volume and density but asked for mass

Multiply: density × volume

Unit check for volume calculation

g ÷ (g/mL) = mL

Unit check for mass calculation

(g/mL) × mL = g

First step in any density problem

Identify what the question is asking for (mass, volume, or density)