MASS-MASS CALCULATIONS

Practice Exercise

1.  H₂ and N₂ react to form ammonia, NH₃.   If 25.0 grams of H₂ react with sufficient N₂, what mass of       

     NH₃ is formed?  The balanced equation is:

                                    N₂  +  3 H₂   -->  2NH₃ 

2.  If 3.0 grams of H₂ are reacted with O₂ , how much H₂O is formed?

                                    2H₂   +   O₂  -->   2H₂O

3.  Aluminum reacts with Iron III Oxide to form aluminum oxide, Al₂O₃, and iron.

                                    4Al   +   2Fe₂O₃   -->         2Al₂O₃   +   4Fe

     How much Fe is formed from 138 grams of Fe₂O₃?

4.  The industrial production of nitric acid, HNO₃, involves this reaction:

                                    4NH₃   +   5O₂     -->    4NO   +   6H₂O

     How much NO is obtained from 85 grams of NH₃?