Chapter 11: Stoichiometry

366 Stoichiometry BIGIdea mass relationships in chemical reactions confirm the law of conservation of Defining StoichiometryMAINIdea The amount of each reactant present at the start of a chemical reaction determines how much product can Stoichiometric CalculationsMAINIdea The solution to every stoichiometric problem requires a balanced chemical Limiting Reactants MAINIdea A chemical reaction stops when one of the reactants is used Percent Yield MAINIdea Percent yield is a measure of the efficiency of a chemical Green plants make their own food through photosynthesis. Photosynthesis occurs within structures called chloroplasts in the cells of plants. The balanced chemical equation for the photosynthesis is:6C O 2 + 6 H 2 O C 6 H 12 O 6 + 6 O 2 On a summer day, one acre of corn produces enough oxygen (a product of photosynthesis) to meet the respiratory needs of 130 dioxide and waterChloroplast CLIVE SCHAUPMEYER/AGSTOCKUSA/SCIENCE PHOTO LIBRARY/Photo Researchers 11 Stoichiometry 367 Start-Up ActivitiesStart-Up ActivitiesLLAAUUNCH NCH LabLabWhat evidence can you observe that a rea

To verify that mass is conserved, first convert moles of reactant and product to mass by multiplying by a conversion factor—the molar mass—that relates grams to moles. moles of reactant or product × ___grams reactant or product 1 mol reactant or product = grams of reactant or product 1 mol C 3H 8 × __44.09 g C 3H 8 1 mol C 3H 8 = 44.09 g C 3H

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  Conversion, Mass, Moles

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