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Lesson: Chapter - 7

Chemical Yields

There are three types of yields you’ll need to be familiar with for the Chemistry test: theoretical yields, actual yields, and percent yields. Here’s a quick review of what all of these mean to you.

The theoretical yield of a reaction is the amount of product formed once the limiting reactant has been completely consumed. This assumes perfect conditions and gives a maximum amount. The actual yield is what actually occurs in the course of the reaction—how much product is actually formed. Finally, the percent yield is the ratio of the actual yield to the theoretical yield, and you can get this value using the following formula:

Going back to our last example, the 28,116 grams you calculated would be the theoretical yield. But what would the percent yield be if you performed this reaction and you actually collected 26,450 grams of ammonia? You would calculate it using the above formula. Here it is with the numbers plugged in:

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