In the reaction given below, for every four moles of aluminum oxide consumed, how many moles of oxygen are produced? 2 al2o3 → 4 al + 3 o2

The answer to your question is 6 moles

Explanation:

Reaction

                          2Al₂O₃   ⇒   4 Al + 3O₂

Check if the reaction is balanced

                  Reactants     Elements   Products

                        4             Aluminum       4

                        6               Oxygen         6      

The number of reactants  and products is the same so this reaction is balanced.

We know that for every 2 moles of aluminum oxide consumed 3 moles of oxygen are consumed so we use proportions to find the answer

                            2 moles of Al₂O₃  3 moles of Oxygen

                             4 moles of Al₂O₃  x

                              x = (4 x 3) / 2

                              x = 12/2

                             x = 6 moles of oxygen