Final answer:
The density of the copper tubing is 8.9 g/cm³.
Step-by-step explanation:
To calculate the density of a solid, we divide its mass by its volume. In this case, the mass of the copper tubing is 106.8 grams and its volume is 12 cm³. Using the formula for density: density = mass/volume, we can calculate the density as:
Density = 106.8 g / 12 cm³ = 8.9 g/cm³
Therefore, the density of the copper tubing is 8.9 g/cm³.