# Section 3 Gas Stoichiometry When gases react the

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Section 3: Gas Stoichiometry When gases react, the coefficients in the balanced chemical equation represent both molar amounts and relative volumes. K What I Know W What I Want to Find Out L What I Learned

• 9(B) Perform stoichiometric calculations, including determination of mass and volume relationships between reactants and products for reactions involving gases. • 8(E) Perform stoichiometric calculations, including determination of mass relationships between reactants and products, calculation of limiting reagents, and percent yield. Copyright © Mc. Graw-Hill Education Gas Stoichiometry

Essential Questions • What stoichiometric ratios can be determined for gaseous reactants and products from balanced chemical equations? • How are the amounts of gaseous reactants and products in a chemical reaction calculated? Copyright © Mc. Graw-Hill Education Gas Stoichiometry

Stoichiometry of Reactions Involving Gases The gas laws can be applied to calculate the stoichiometry of reactions in which gases are reactants or products. 2 H 2(g) + O 2(g) → 2 H 2 O(g) 2 mol H 2 reacts with 1 mol O 2 to produce 2 mol water vapor. Copyright © Mc. Graw-Hill Education Gas Stoichiometry

Stoichiometry and Volume-Volume Problems Coefficients in a balanced equation represent volume ratios for gases. • A balanced chemical equation allows you to find ratios for only moles and gas volumes, not for masses. • All masses given must be converted to moles or volumes before being used as part of a ratio. Copyright © Mc. Graw-Hill Education Gas Stoichiometry