# Percentage Yield Formula

Reactants often yield quantities of products that are less than those calculated on the basis of 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}$$\times 100% The amount of product actually made compared with the maximum calculated yield is called the percentage yield. ## Percentage Yield Solved Problem Back to Top Question 1:During a chemical reaction0.6g of product is made. The maximum calculated yield is 1.4g. What is the percentage yield of this reaction? Solution: Substitute the values in the corresponding formula Percentage yield = \frac{actual yield}{theoretical yield}$$\times$ 100%

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

Percentage yield = 42.9%

The percentage yield of this reaction is 25%, Scientist tries to choose reactions with a high percentage yield or high atom economy. This contributes to sustainable development by reducing waste.