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# Stoichiometry

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### Stoichiometry

1. 1. Stoichiometry
2. 2. You already know... In a balanced equation the coefficients are MOLES. 2H 2 + O 2 -> 2H 2 O 2 moles Hydrogen, 1 mole Oxygen, 2 moles H 2 O How to Calculate Molar Mass: H 2 O = H 2 x 1.01 = 2.02 O 1 x 16.00 = 16.00 18.02 g/mol 1 mole of anything is 22.42 L examples: 1 mole water = 22.42 L 1 mole H 2 SO 4 = 22.42 L 1 mole acetic acid = 22.42 L
3. 3. Before the Math <ul><li>Balance the equation. </li></ul><ul><ul><li>You need the coefficients. </li></ul></ul><ul><li>Look at what numbers the question provides. </li></ul><ul><ul><li>Start with the number given. </li></ul></ul><ul><li>Look at what the question is asking for. </li></ul><ul><ul><li>This is where you stop. </li></ul></ul><ul><ul><li>It is also the correct label. </li></ul></ul>
4. 4. The Math <ul><li>Step 1: Get to the mole. </li></ul><ul><li>Step 2: Mole to mole ratio from the balanced equation. </li></ul><ul><li>Step 3: Use the mole to get to what you want. </li></ul><ul><li>*KEEP LIKE TERMS DIAGONAL. </li></ul>
5. 5. Finding Moles (this is going to be the first step in all the other types of problems) <ul><li>How many moles of oxygen are formed if 1.34 moles of H 2 O 2 completely decomposes? </li></ul><ul><li>1) Write and balance: </li></ul><ul><li>2H 2 O 2 -> 2H 2 O + O 2 2:2:1 </li></ul><ul><li>2) Do the math </li></ul>= .67 mol O 2 1.34 mol H 2 O 2 (from the problem) 1 mol O 2 (from equation) 2 mol H 2 O 2 (from equation)
6. 6. Finding Liters <ul><li>If I produce 2.4 L of oxygen in the decomposition of H 2 O 2 , how many L of H 2 O 2 did I start with? </li></ul><ul><li>1) Write and balance: </li></ul><ul><li>2H 2 O 2 -> 2H 2 O + O 2 2:2:1 </li></ul><ul><li>2) Do the math: </li></ul>= 4.8 L H 2 O 2 2.4 L O 2 1 mol O 2 2 mol H 2 O 2 22.42 L H 2 O 2 22.42 L O 2 1 mol O 2 1 mol H 2 O 2
7. 7. Finding Grams <ul><li>In the decomposition of H 2 O 2 , how many grams of H 2 O 2 are required to produce 3.7g of water? </li></ul><ul><li>1) Write and balance: 2H 2 O 2 -> 2H 2 O + O 2 2:2:1 </li></ul><ul><li>2) Because it is grams you need molar masses: </li></ul><ul><li>O 2 = 32.00 g/mol, H 2 O = 18.02 g/mol, H 2 O 2 = 34.02 g/mol </li></ul><ul><li>3)Do the math. </li></ul>= 7.02 g H 2 O 2 3.7 g H 2 O 1 mol H 2 O 2 mol H 2 O 2 34.02 g H 2 O 2 18.02 g H 2 O 2 mol H 2 O 1 mol H 2 O 2
8. 8. Grams to Liters? The mole allows for any calculation. <ul><li>In the decomposition of H 2 O 2 , how many L of H 2 O 2 are required to produce 1.5 g of water? </li></ul><ul><li>1) Write and balance: 2H 2 O 2 -> 2H 2 O + O 2 2:2:1 </li></ul><ul><li>2) Do the math: </li></ul>= 1.87 L H 2 O 2 1.5 g H 2 O 1 mol H 2 O 2 mol H 2 O 2 22.42 L H 2 O 2 18.02 g H 2 O 2 mol H 2 O 1 mol H 2 O 2