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Stoichiometry

Stoichiometry. Stoichiometry. Remember. Chemicals react in molar ratios Ex) . 4Fe + 3O 2  2Fe 2 O 3. This balanced equation gives us the _________ ratio of reactants Can’t be directly measured, but grams can be. 4Fe + 3O 2  2Fe 2 O 3 Molar Ratios. mols Fe : mols O 2

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Stoichiometry

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  1. Stoichiometry

  2. Stoichiometry

  3. Remember • Chemicals react in molar ratios • Ex)

  4. 4Fe + 3O2 2Fe2O3 • This balanced equation gives us the_________ratio of reactants • Can’t be directly measured, but grams can be

  5. 4Fe + 3O2 2Fe2O3Molar Ratios • molsFe :mols O2 • molsFe :mols Fe2O3 • molsO2 :mols Fe2O3 • So, if I have 2.5 mols of Fe, how many mols of Fe2O3 can I potentially produce?

  6. Hint • ALWAYS BALANCE YOUR EQUATION FIRST!!! • Determine what the question is asking for and what you are starting with • Mol to mol • Mole to grams • Grams to grams

  7. Mol – mol conversionC3H8 + O2  CO2 + H2O • What is the ratio of moles of C3H8 to CO2? • How many moles of CO2 are produced if 10.0 moles of C3H8 are used? • How many moles of O2 are needed to produce 7.2 moles of CO2?

  8. Mol – gram conversionC3H8 + O2  CO2 + H2O • How many grams of water are produced given 3.4 moles of C3H8? • How many moles of oxygen are needed to produce 12.5 grams of carbon dioxide?

  9. Gram - gram conversionC3H8 + O2  CO2 + H2O • How many grams of carbon dioxide are produced if 12 grams of C3H8 are burnt in the combustion reaction? • How many grams of oxygen are needed to produce 25.5 grams of water?

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