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Stoichiometry

Stoichiometry. Stoichiometry is the study of quantitative or measurable relationships that exist in a chemical equation. When you have a balanced chemical equation, what are the coefficients telling you about each compound?. Coefficients tell you 3 things:

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Stoichiometry

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  1. Stoichiometry

  2. Stoichiometry is the study of quantitative or measurable relationships that exist in a chemical equation. When you have a balanced chemical equation, what are the coefficients telling you about each compound? Coefficients tell you 3 things: a. number of particles (atoms, f.u. molecules) b. number of moles c. number of liters (if a gas)

  3. What does stoichiometry help us with? What can it help us decide? Using stoich you can determine the amount of products made and reactants used before you even start the lab process. Solving Stoichiometric Problems In this process there will be a maximum of 3 steps. If you know some type of information about 1 substance, you can use the balance equation to find an amount for all other substances.

  4. 3 steps of stoich 1. Convert given amount to moles 2. Bridge This is where we will be able to use the molar ratios of the coefficients to convert to a new substance. This step is ALWAYS done! 3. Convert back to wanted unit.

  5. Mole – Mole conversions 2Na + S  Na2S If you have 3mols of Na, how many moles of product will you form? 1st decide how many steps will we need to do? 3mol Na 1 mole Na2S = 1.5 moles Na2S 2 mole Na

  6. Mass – Mole Conversions 2Na + S  Na2S If you have 88g of Na, how many mols of S would you need to completely react with it? How many steps? Step 1 Step 2: bridge 88g Na 1 mole Na 1 mole S = 1.91 mol S needed 2 mole Na 22.99g Na How would this be different if it were Liters to Moles or Atoms to Moles?

  7. Mass – Mass Conversion 2Na + S  Na2S If you have 120g of Na, how many grams of Na2S will be formed? 60g?? How many steps? Step 1 Step 2 Step 3 120g Na 1 mol Na 78.04g Na2S = 203.67 g Na2S 1 mol Na2S 2mol Na 1 mol Na2S 22.99g Na What would you do differently if you went to f.u. of Na2S?

  8. Stoichiometry Quiz 1 Use the following equation: Balance it 1st!!!!!! CuSO4 + Al(NO3)3 Cu(NO3)2 + Al2(SO4)3 1. If you have 3.5mols of copper sulfate how many moles of aluminum sulfate will you make? 1.16mols 2. If you have 3.5mols of copper sulfate how many grams of aluminum nitrate do you need to react with it? 497.05g 3. How many f.u. of copper nitrate will be made from 10g of copper sulfate? 3.77 e 22 f.u.

  9. Vocabulary Quiz • The ratio of the actual yield to the theoretical yield. • A quantity of reactant that is more than enough to react. • The calculation of quantities in chemical equations. • The relationship between moles of 2 substances in a chemical reaction. • The calculated amount of product that can be made. • Actual yield b. Limiting reactant c. theoretical yield d. Stoichiometry • e. Mole f. Percent yield g. Excess reagent h. molar ratio

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