Extend. For compounds, it is sometimes necessary to calculate the number of atoms of each element within a molecule Select Iron(II) chloride Note the image of the molecule A. How many Fe atoms are within a single FeCl2 molecule? B. How many Cl atoms are within a single FeCi: molecule? C. Use the nano balance to find the mass of each of these atoms: Mass of Fe atom. Mass of CI atom. D. Find the sum of their masses (1 Fe atom + 2 Cl atoms): E Place the FeCl: molecule on the balance. Is the sum of the masses of the individual atoms equal to the molecular mass of the compound? 9 Calculate Select Copper(I)oxide. Note the image of the molecule Place it on the balance A How many moles of copper would be needed to make 1 mole of Cu:0? B How many grams of copper would you need? Grams of oxygen? 13 C In addition to showing the ratio of atoms in a molecule, what else do the subscnpts in a fomula tell us?​