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Percent Yield

The amount of product calculated to form in a reaction by doing a stoichiometry problem is called the theoretical yield.

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This represents the maximum amount of product that could form.

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Many times, however; the amount of product actually obtained is less than predicted.

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The measured amount of product obtained from the reaction is called the actual yield.

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Percent Yield is used to evaluate the efficiency of a reaction. Actual Yield Percent Yield = ---------------------------- x 100 Theoretical Yield

Percent Yield

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Consider the reaction: 2 C (s) + 2 H 2 O (g)

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CH 4 (g) + CO 2 (g) a)How many grams of CH 4 225 g C?

be produced from b)If 120 g of CH 4 was actually collected from the reaction, then what was the percent yield for the reaction?

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Aluminum reacts the copper (II) sulfate according to the reaction below. If 1.85 g Al reacts and the percentage yield is 56.6%, what mass of Cu is produced?

2 Al (s) + 3 CuSO 4 (aq)

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Al 2 (SO 4 ) 3 (aq) + 3 Cu (s)

Sample EOC Question

During the production of aspirin, 2.6 g of aspirin can be formed from 2.0 g of salicylic acid. What is the percent yield if only 1.7 g of aspirin is produced?

A. 35 % B. 65% C. 77% D. 85%

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Wrapping It Up

Reflect on what you have learned concerning the today’s topic.

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Respond to the following…

– What is the most important thing you learned today?

– What is one question you would still like answered?

– What is a way what you have learned today connects with what you knew before?