What is the mass, in grams, of a pure iron cube that has a volume of 3.70cm cubed?

To determine the amount in grams of the iron, we need data on the density of iron. From literature, it has a value of p=7.9 g/cm3. We simply multiply the volume to the density. We do as follows:

mass = 3.70 (7.9) = 29.23 g Fe

Hope this answers the question. Have a nice day.