Final answer:
The mass of brass is calculated by multiplying its density (8.4 g/cm³) by its volume. Without the volume being provided, we cannot calculate the exact mass, but with a hypothetical volume, we can demonstrate how this calculation would be performed.
Step-by-step explanation:
To calculate the mass of brass knowing the volume, you can use the formula for density: density = mass / volume. Rearranging the formula to solve for mass gives us mass = density × volume. If we have the density of brass as 8.4 g/cm³, then we can multiply this by the volume of the brass to find its mass. However, the student's question does not provide the volume of the brass, so we cannot calculate the mass without that information. We can show an example using a hypothetical volume: if the volume were 5 cm³, then the mass would be 8.4 g/cm³ × 5 cm³ = 42.0 grams.