1. 1. 1. If it takes approximately 5.92 x 10¹⁷ molecules of ATP to flex your toes one time. How many times can you flex your toes with the number of ATP molecules from question 3? 

   2. 2. (Solid Iron reacts in the presence of oxygen to make Iron (III) oxide. If 50 g of solid iron reacts with 50 grams of oxygen how many grams of iron (III) oxide are produced? How many grams of the excess reagent remain?

   3. 3. Carbon monoxide reacts with iron (II, III) oxide (Fe₃O₄) making iron and carbon dioxide. When a student performed the experiment he reacted 70.0 g of Fe₃O₄ with 70.0 g of CO and the actual yield of iron was 41.9. Calculate the percentage yield.

   4.  4. The reaction below consistently yields 82% of the theoretical value. If you need to make 10 g of Mg(OH)₂ How much Mg₃N₂ (g) should you use (assume that you will use H₂O in excess).

         Mg₃N₂(s) + H₂O(l) → Mg(OH)₂(s) + NH₃(g)