# Chapter 9 Notes Answers

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 Coefficients
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 ratios that represent the relativenumber of molecules, atoms, or formula units in a chemical equationthat are needed to maintain the law of conservation of matter.
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 Mole Ratios
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 Also called conversion factors, are the ratios createdfrom the coefficients in the balanced chemical equation.
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 Steps for Calculating the Masses of Reactants and Products inChemical Reactions
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 路 Balance the equation for the reaction.路 Convert the masses of reactants or products to moles.路 Use the balanced equation to set up the appropriate mole ratio(s).路 Use the mole ratio(s) to calculate the number of moles of thedesired reactant or product.路 Convert from moles back to masses.
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 BCA Tables: Tables that are used to help organize stoichiometryproblems.
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 路 Only moles can go into the BCA Table路 Helps Visualize ratio
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 Limiting Reagent (Reactant)
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 The reactant that limits the amountof products that can be formed. It is used up first.
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 Reactant(s) in Excess
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 The reactant(s) that is/are present afterthe limiting reagent is used up.
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 Steps of Solving Stoichiometry Problems Involving LimitingReactants.
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 路 Write and balance the equation for the reaction.路 Convert known masses of reactants or products to moles.路 Using the numbers of moles of reactants or products and theappropriate mole ratios, determine which reactant is limiting.路 Using the amount of the limiting reactant and the appropriatemole ratios, compute the number of moles of the desiredproduct.路 Convert from moles of product to grams of product, using themolar mass (if this is required by the problem.
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 %Yield
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 (Actually Yield / Theoretical Yield) x 100

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