Final answer:
The density of the crayon is 2.0 g/mL.
Step-by-step explanation:
The formula to calculate density is D = m/V, where D is density, m is mass, and V is volume. To find the density of the crayon, we divide the mass (10.0 g) by the volume (5.0 mL).
Density = mass/volume = 10.0 g / 5.0 mL = 2.0 g/mL.
Therefore, the density of the crayon is 2.0 g/mL.