The formula for density = mass/volume. We know the density (21.45 g/cm³) We know the volume (80.00 cm³) of the sample We don't know the mass, so first - solve the equation for mass:
D=m/v [multiply v to both sides to isolate m] Dv=m
Now, insert the known value and units...make sure the units cancel properly: 21.45 g/cm³ x 80.00 cm³ = 1716 g
