What is a sample of iron has the same dimensions of 2 cm x 3 cm. if the mass of this rectangular-shaped object is 94 g what is the density of iron?

The volume of the iron sample is length x width x height = 2 cm x 3 cm x unknown height. We know that the mass is 94 g. The density of iron is mass/volume, so you can calculate the height of the sample first and then plug in the values to find the density.