1. Stoichiometry Or: a fancy way to say how much!

2. It is a very mathematical part of chemistry, so be prepared for lots of calculator use

3. So what does that mean?? It means that if you want to make anything, You have to follow the recipe. When you follow a recipe, You often have some things left over.

4. For example:

5. Stoichiometry To make a BLT, you need: 1 lettuce leaf 3 tomato slices 2 slices of bread 3 bacon slices OR L + 3T + 3Ba + 2Br  BLT

6. More Examples If you have 2 lettuce, 6 tomato, 7 bacon and 4 bread, how many BLT’s can you make? 2 sandwiches What do you call the items you run out of?? Limiting reagents What do you call the leftovers?? Excess Reagents

7. This is True for Chemical Reactions 2H 2 + O 2  2H 2 O Subscripts tell you the amount of atoms/particles in the chemical compound. Coeffiecents tell you the amount of the chemical.

8. What is the amount used in Chem?? Moles !! Yes 6.02 x 10 23 particles/mol 2H 2 + O 2  2H 2 O For every 1 mole of O 2 used there are 2 moles of H 2 used.

9. 2H 2 + O 2  2H 2 O If you have 2 moles of H 2 and 1 mole of O 2, how much H 2 O may be formed? Answer: 2 moles If you have 5 moles of H 2 and 2.5 moles of O 2 ?? Answer: 5 moles If you have 10 moles of H 2 and 5 moles of O 2 ? Answer: 10 moles

10. But if your question is in grams? IF you have 2 grams of H 2 and 16 grams of O 2, how many moles of water can you make? Answer: One mole How many grams is that? Answer: 18 grams

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