Question

question 1
what is the density of a substance?
the ratio of the substances mass to the volume it occupies.
the mass of the substance in a vacuum.
the ratio of the number of moles of the substance to its mass.
the volume that a substance displaces.

Explanation:

Density is defined as the mass - per - unit volume of a substance. Mathematically, density $
ho=\frac{m}{V}$, where $m$ is the mass and $V$ is the volume.

Answer:

The ratio of the substance's mass to the volume it occupies.