Section 12 - Calculating Percent Yield - Math Tutor DVD

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Section 12 - Calculating Percent Yield Section 12 - Calculating Percent Yield
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Overview of this Lesson

In this lesson, we introduce the important topic of Calculating Percent Yield in chemistry. Percent yield is a calculation that compares how much product we actually produce with how much product that we calculate that we should produce. In every reaction in a real lab, we will always produce a bit less product than we calculate. Percent yield measures how close we can get.

Before we can begin calculating percent yield, we must define it. The Theoretical yield just means that this is how much product we should produce using our calculation methods of stoichiometry. Actual yield simply means that this is what we actually measure in the lab when we perform the experiement and allow the reaction to run to completion.

Percent Yield is then defined to be:

Percent Yield = (Actual Yield)/(Theoretical Yield)*100

So, we essentially divide the actual and theoretical yield and then multiply the result by 100. Multiplying by 100 just changes our answer to a percentage.

So, if we calculate the percent yield to be exactly 100%, then we learn that our reaction was perfect and we actually produced every gram of product that we calculated that we should produce.

If we calculate a percent yield of 50%, then it means that we actually produced half of the amount of product that we calculate that we should produce.

Calulating percent yield can be seen to be a way to determine how well we performed our reaction and how close to "perfect" we can come. In this lesson, we work numerous problems to reinforce this material and give the student more practice with these types of problems.

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