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Stoichiometry

Stoichiometry. Mole Map. Mass Mountain. Mole Island. Particle Peninsula. Using the Mole Map with Chemical Equations. We can convert between Moles, Particles and Grams, but… This only gives us information about one substance!

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Stoichiometry

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  1. Stoichiometry

  2. Mole Map Mass Mountain Mole Island Particle Peninsula

  3. Using the Mole Map with Chemical Equations • We can convert between Moles, Particles and Grams, but… • This only gives us information about one substance! • How do we determine how much reactants to use in a chemical reaction? Or how much product we will create? STOICHIOMETRY

  4. Ratio of eggs to cookies Proportional Relationships 2 1/4 c. flour 1 tsp. baking soda 1 tsp. salt 1 c. butter 3/4 c. sugar 3/4 c. brown sugar 1 tsp vanilla extract 2 eggs 2 c. chocolate chips Makes 5 dozen cookies. I have 5 eggs. How many cookies can I make? 5 eggs 5 doz. 2 eggs 150 cookies = 12.5 dozen cookies Courtesy Christy Johannesson www.nisd.net/communicationsarts/pages/chem

  5. Mole Ratio • A conversion factor that converts moles of one compound in a balanced chemical equation into moles of another compound. 2 H2 + O2 2 H2O • Coefficients tell how many particles (or MOLES of particles) of each chemical is needed in the reaction.

  6. Mole Ratios How many moles of water will be formed if I react 14.0 moles of oxygen with excess H2? 2 H2 + O2 2 H2O 14.0 moles O2 x 2 moles H2O = 28.0 moles H2O 1 mole O2 MOLE RATIO From the balanced equation. Coefficients tell moles of each substance.

  7. Stoichiometry Sea KnownUnknown Substance ASubstance B Mass Mountain Mass Mountain Mole Ratio Raft Mole Island Mole Island Particle Peninsula Particle Peninsula

  8. Known Substance A Unknown Substance B Mass Mass 1 mole = molar mass (g) 1 mole = molar mass (g) Mole Use coefficients from balanced chemical equation Mole 1 mole = 6.022 x 1023 particles (atoms or molecules) 1 mole = 6.022 x 1023 particles (atoms or molecules) Particles Particles

  9. Stoichiometry Steps 1. Write a balanced equation. 2. Identify known & unknown. 3. Line up conversion factors. • Mole ratio - moles  moles • Molar mass - moles  grams • Mole ratio - moles  moles 4. Check answer. Core step in all stoichiometry problems!! Courtesy Christy Johannesson www.nisd.net/communicationsarts/pages/chem

  10. How many moles of KClO3 must decompose in order to produce 9 moles of oxygen gas? 2KClO3 2KCl + 3O2 ? mol 9 mol 2 mol KClO3 6 mol x mol KClO3 = 9 mol O2 = 6 mol KClO3 3 mol O2 O2 KClO3 Courtesy Christy Johannesson www.nisd.net/communicationsarts/pages/chem

  11. Stoichiometry 2 TiO2 + 4 Cl2 + 3 C CO2 + 2 CO + 2 TiCl4 x mol 4.55 mol x molecules 115 g x g How many moles of chlorine will react with 4.55 moles of carbon? 4 mol Cl2 x mol Cl2 = 4.55 mol C = 6.07 mol Cl2 3 mol C C Cl2 How many grams of titanium (IV) oxide will react with 4.55 moles of carbon? 80 g TiO2 2 mol TiO2 x g TiO2 = 4.55 mol C = 243 g TiO2 1 mol TiO2 3 mol C C TiO2 How many molecules of TiCl4 will react with 115 g TiO2? 2 mol TiCl4 6.02x1023molecules TiCl4 1 mol TiO2 x molecules TiCl4 = 115 g TiO2 2 mol TiO2 1 mol TiCl4 80 g TiO2 = 8.66x1023 molecules TiCl4 TiO2 TiCl4

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