Chapter 9 Notes Answers

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Coefficients
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ratios that represent the relative
number of molecules, atoms, or formula units in a chemical equation
that 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 created
from the coefficients in the balanced chemical equation.
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Steps for Calculating the Masses of Reactants and Products in
Chemical 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 the
desired reactant or product.
路 Convert from moles back to masses.
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BCA Tables: Tables that are used to help organize stoichiometry
problems.
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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 amount
of 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 after
the limiting reagent is used up.
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Steps of Solving Stoichiometry Problems Involving Limiting
Reactants.
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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 the
appropriate mole ratios, determine which reactant is limiting.
路 Using the amount of the limiting reactant and the appropriate
mole ratios, compute the number of moles of the desired
product.
路 Convert from moles of product to grams of product, using the
molar 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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