Mole to Mass and Mass to Mole Problems

• Some Questions will give you an amount os moles and ask you to determine the mass
• Converting moles to mass only required one additional step

Example:

• When Silver reacts with 3.45 moles of Zinc phosphate what mass of Silver Phosphate would be produced?

                                               6Ag + ZN3(PO4)2 -> 2AG3(PO4) + 3Zn
                                              3.45mol x 2/1 x 418.7g/1mol = 2.89 x 10^3g

• Iron burns in air by reacting with Oxygen. If 5.6 g of Iron are completely burned, how many moles of Iron (III) Oxide are formed?

                                                                4Fe = 3O2 -> 2FE2O3

                                                        5.6g x 1mol/55.8g x 2/4 = 0.050mol

Moles to Mass:

Mass to Moles:

- George Spencer