2. Rufus StoichiometryRufus Stoichiometry 1)Check for balanced chemical equation and place your game piece/finger on the number given in the problem. 2)Use Rufus—how many steps/hops do you need to make to get to the desired unit. 3)Build picket fence—  # hops = # of vertical lines 4)Number given in the problem along with the unit goes on the top of the picket fence and drop the unit only down to the next space (“drop it like it’s hot”) 5)Hops go on top.

3. Rufus Stoichiometry (cont.)Rufus Stoichiometry (cont.)  Stay on the roads (lines), read sign, and keep going.  Roads = conversion factors  Only use the roads to move square to square (“hops”)  Mole ratio =  ratio of moles between two chemical compounds  Used as a bridge to convert from one chemical compound to another  Uses coefficients from chemical equation

4. Example 1:Example 1: How many moles of NH 3 will be formed from the reaction of 8.0 moles of H 2 with excess N 2 ? N 2 + 3H 2  2NH 3 -(Rufus Method)

5. Example 2:Example 2: How many grams of NH 3 will be formed from the reaction of 26 grams of N 2 with excess H 2 ? N 2 + 3H 2  2NH 3 -(Rufus Method)

6. Example 3:Example 3: How many liters of CO 2 are produced when 25.0 grams of C 2 H 6 combusts? 2C 2 H 6 + 7O 2  4CO 2 + 6H 2 O -(Rufus Method)

7. Example 4:Example 4: How many grams of sodium chloride will be produced when 7 grams of sodium react with excess chlorine gas? -(Stoichiometry Beginner Guide Method)

8. Example 5:Example 5: How many grams of aluminum oxide will be produced when 12 grams of aluminum react with excess oxygen gas? - (Stoichiometry Beginner Guide Method)

9. Homework  Stoichiometry Worksheet