we are given with a density of iron equal to 7.86 g/cm3 and is asked for the volume of the piece when there is a mass of 4.54 kg. In this case, we convert g/cm3 to kg/dL first. 1 g/cm3 is equal to 0.1 kg/dL that is the density is equal to 0.786 kg/dL. A mass if 4.54 kg is equivalent to 5.78 dL