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Stoichiometry

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This guide explains the fundamentals of stoichiometry, focusing on the relationships between reactants and products in chemical reactions using molar ratios. We illustrate with balanced equations such as 4Fe + 3O2 → 2Fe2O3 and C3H8 + O2 → CO2 + H2O. Learn how to determine the potential yield of products based on reactant amounts, including conversions between moles and grams. Practice problems are provided to reinforce your understanding, ensuring you can confidently apply these concepts to various chemical scenarios.

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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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