What is the density of a sample of a substance with a volume of
120 mL and a mass of 90 grams?

The density of the unknown substance is 0.75 g/mL.

Explanation:

We are given the volume and mass of a substance and are asked to find the density.

Density is determined with the formula , where d is the density, m is the mass of the substance, and v is the volume the substance occupies.

Therefore, the density can be found by dividing the mass and volume.

We are given and can determine that:

Now, let's set up the math required.

Therefore, the density of the substance is 0.75 g/mL.