Percent Yield and Limiting Reagents - Oak Park Independent

Percent Yield

and Limiting Reagents

February 17, 2015

Percent Yield

? Theoretical yield: the maximum

amount of product, which is calculated

using the balanced equation

? Actual yield: the amount of product

obtained when the reaction takes place

Reasons for Percent Yield

? There are many reasons you might not get the

expected amount of product from a reaction

? Sources of error, nature of rxn

? Percent Yield measures how much of the

expected product you actually get

? If a package of chocolate chips is supposed to

make 48 cookies, but you only make 34 cookies

out of it, you didn¡¯t get 100% yield

Calculating Percent Yield

? Percent Yield Formula

Measure it (given in problem)

actual yield

percent yield =

x 100

theoretical yield

Use Stoichiometry

Percent Yield Problem #1

? What is the percent yield of this reaction if 24.8 g of

CaCO3 is heated to give 13.1 g of CaO?

CaCO3 ¨¤? CaO + CO2

? To find out how much product should be made:

? Set the problem up like you would a Mass-Mass

Stoichiometry Problem

1. Balance The Equation

2. Convert Grams to Moles

3. Complete Mole Ratio

4. Convert Moles to Grams

? Then find % yield using the formula

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