What is the mass of a steel cylinder that has a density of 75.0 g/ml and a volume of 12 ml?

Density can be calculated using the following rule:

Density = mass / volume

Therefore:

mass = density * volume

We are given that:

Density = 75 g/ml

volume = 12 ml

Substitute with these givens in the equation to get the mass as follows:

mass = density * volume

mass = 75 * 12

mass = 900 g