How to Find Theoretical Yield? Formula & Example

How to find theoretical yield? In the lab, chemists strive to produce the maximum amount of the desired product from a given amount of starting material. This is called the theoretical yield. Theoretical yield is calculated by using the molecular weight of the desired product and the stoichiometry of the reaction. In order to achieve the maximum yield, all of the reactants must be used up in the reaction. If any reactant is not fully converted to a product, then the yield will be lower than predicted.

The theoretical yield can be affected by several factors including temperature, solvent, and catalyst concentration. Increasing any of these parameters will usually result in an increased yield. However, there is always a point at which further increases in temperature or concentration will have no effect or even decrease the yield.

A theoretical yield is a valuable tool for predicting how much product can be obtained from a given reaction.

How to Find Theoretical Yield?

In order to determine the theoretical yield of a chemical reaction, you need to know the balanced equation for the reaction and the molar masses of all of the reactants.

You can then use stoichiometry to calculate how much of each reactant is needed to produce the desired product. The theoretical yield is the maximum amount of product that could be produced from the given amount of reactants.

However, in most cases, not all of the reactants are used up in the reaction, so the actual yield will be less than the theoretical yield.


An example of a theoretical yield calculation can be seen with the synthesis of ammonia from nitrogen and hydrogen gases.

The balanced equation for this reaction is: 2 N2(g) + 3 H2(g) → 2 NH3(g). If we assume that all of the nitrogen and hydrogen react, then the theoretical yield would be 6 grams of ammonia.

However, in practice, only a small fraction of the nitrogen and hydrogen will actually react, so the actual yield will be lower than 6 grams.

Percent Yield

In order to produce the desired product, many chemical processes and steps are often required. In some cases, different products can be produced from the same starting material through slight variations in the process.

The percent yield is a measure of how much of the desired product is actually produced from the starting material. This value is determined by comparing the amount of product obtained to the maximum amount of product that could theoretically be obtained from the reaction conditions.

A low percent yield may indicate that not all of the desired product was produced, while a high percent yield suggests that most of the desired product was obtained. In some cases, it may be necessary to purify the final product in order to achieve a high percent yield.

Percent Yield = Actual Yield/Theoretical Yield×100%

Actual yield

In farming, the term “yield” typically refers to the amount of product harvested from a certain area of land. This harvested product can be in the form of grains, vegetables, fruits, or other types of crops. The yield from a piece of land is often an important factor in determining its overall value.

While there are many factors that go into calculating a farm’s yield, the most important one is usually the actual harvest. In order to get an accurate calculation, farmers need to measure how much they produce per acre or hectare. This number can vary depending on a variety of factors, including weather conditions, type of crop planted, and soil quality.

Despite these variations, it’s important for farmers to have a general idea of their average yield so they can make informed decisions about their business.

How to Calculate Percent Yield in Steps?

yield calculation is an important step in manufacturing and laboratory processes. A yield calculation will tell you how much product you have created in relation to the amount of reactants used. To calculate percent yield, you will need to know the actual yield and the theoretical yield.

The actual yield is the amount of product that was created in the reaction. The theoretical yield is the amount of product that should have been created if there were no errors or losses in the reaction. To calculate percent yield, divide the actual yield by the theoretical yield and multiply by 100%.


Mainly in the development and manufacturing of the medications. It keeps the purity of the percent yield knowing of both the chemical and medicine, respectively. The balance needed to be struck in the equation in the process of manufacturing to being or merely forming the reactions of chemicals. Which, will in theory, also lower the chances of contamination.

Below are the examples to illustrate the prime examples of steps used to find the percent yield:

Say, the product of yours is around acetaminophen of 0.198g by utilizing the other 01.57 gram of acetaminophen and some other elements of acetic anhydride p-acetaminophen are listed as one of the limiting reagents.

  • In order to find out the theoretical yield, do the multiplication of the acetaminophen mass, with a total of 0.157 gram by the acetaminophen molar mass. Due to this, it will be 151,2 grams. In the theoretical yield, the results of it are 0.217 grams.
  • The second step will deal with the identification of the decimal percentage which will yield by using the chemical formula. In the totality, the yield of acetaminophen will be pegged around 0.198 grams, and this further breakdown into 0.217 grams by the theoretical yield. The actual reported yield will be around 0.19 much lower than the theoretical yield. When it comes to decimal percentage it will be around 0.91244 percent yield. Before it moves to the main part of the theoretical yield it will comprise.

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