14-3

**Smores Stoichiometry** **<---Previous Assignment - Next Assignment--->media type="custom" key="6581975"**
 * __Instructions__ **
 * // Make as many smores as you can with the ingredients you have according to the instructions. //
 * // Finish through the "analysis" section before you begin to eat them. //
 * // Wash you hands and keep the food on a paper towel. //
 * //Answer the questions on a piece of paper//


 * __Lab__ **
 * Objective:** Construct as many mini-S’mores as possible. Do not eat the finished S’mores until the end of the lab.

Recipe for a complete S’more 2 Teddy Grahams (chemical symbol Tg) 1 Mini Marshmallow (chemical symbol Mm) 3 Chocolate Chips (chemical symbol Cc)

The unbalanced equation for this reaction is: Tg + Mm + Cc → Tg 2 MmCc 3 1. Balance the above equation. Using the contents of your bag, construct as many complete S’mores as possible. (just make piles, they wont stick) 2. How many complete S’mores were you able to construct? 3. How many Tg did you have left over? 4. How many Mm did you have left over? 5. How many Cc did you have left over? 6. Which reactant limited the number of S’mores you could make? 7. Which reactants did you have an excess of? 8. Explain what a limiting reactant is. Think about your answer to number 1 to help. 9. Write a definition of an excess reactant that would explain to a non-chemistry student doing this lab what an excess reactant is. 10. If you worked at a company making things with chemicals and you just mixed random amounts of chemicals would all of them react to make the product? (think about me randomly pooring Tg, Mm, & Cc on your napkin.... Did it work out perfectly, or did you have left over reactants?)
 * Procedure**:

Suppose you were given an unlimited amount of Tg and Mm, but only 3 Cc: 11. How many Tg2MmCc3S can you make? 12. How many Tg would you need? 13. How many Mm would you need?

Suppose you wanted to make 24 Tg2MmCc3 to serve your class: 14. How many Tg would you need? 15. How many Mm would you need? 16. How many Cc would you need?