Percentage Yield Formula

Reactants often yield quantities of products that are less than those calculated based on the formulated chemical reaction. The per cent yield formula is used to determine the percentage of the theoretical yield that was formed in a reaction.

The ideal amount of product is called the theoretical yield and it is obtained by working a stoichiometry problem. Measuring the amount of product formed gives us the actual yield. From the ratio of the actual yield to the theoretical yield, we can calculate the percentage yield.

Percentage yield = $\frac{Actual\; yield}{Theoretical\; yield}$$\times$ 100%

The amount of product actually made compared with the maximum calculated yield is called the percentage yield.

Percentage Yield Solved Problem

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Question 1: During a chemical reaction 0.6 g of product is made. The maximum calculated yield is 1.4 g. What is the percentage yield of this reaction?

Solution:

Substitute the values in the corresponding formula

Percentage yield = $\frac{Actual\; yield}{Theoretical\; yield}$$\times$ 100%

Percentage yield = $\frac{0.6}{1.4}$$\times$ 100%

Percentage yield = 42.9%

The percentage yield of this reaction is 42.9%, Scientist tries to choose reactions with a high percentage yield or high atom economy. This contributes to sustainable development by reducing waste.

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