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Chem 20 Review: Stoichiometry

Chem 20 Review: Stoichiometry. Mole Ratios. Mole ratios will be used in every stoichiometry question so it is important that we understand how they work Mole ratios are derived from the COEFFICIENTS of a BALANCED CHEMICAL EQUATION

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Chem 20 Review: Stoichiometry

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  1. Chem 20 Review: Stoichiometry

  2. Mole Ratios • Mole ratios will be used in every stoichiometry question so it is important that we understand how they work • Mole ratios are derived from the COEFFICIENTS of a BALANCED CHEMICAL EQUATION • Please follow along with the example on the following slide

  3. i.e.: 2 H2 + O2 2 H2O • Ratio of H2 to O2 = 2:1 or 2 1 • For every 2 moles of H2, there is 1 mole of O2 • Ratio of H2 to H2O = 2:2 or 1or 1 1 1 • For every 2 moles of H2, there are 2 moles of H2O *It can also be inverted depending on what you are comparing* • Ratio of O2 to H2 = 1:2 or 1 2 • For every 1 mole of O2, there are 2 moles of H2 • Ratio of H2O to H2 = 2:2 or 2 or 1 2 1 • For every 2 moles of H2O, there are 2 moles of H2

  4. 4 Steps for Solving ANY Stoichiometry Question • 1) Write a BALANCED chemical equation • 2) Take whatever value is GIVEN in the question and CONVERT IT TO MOLES • 3) Use the MOLAR RATIOS from the balanced chemical equation to identify the number of moles for the chemical you need • 4) Go where the question asks using the REBALANCED EQUATION

  5. Example: • What mass of oxygen gas will react with 15.0g of hydrogen gas and what mass of water will be produced?

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