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Try an example: Calculate the percent yield of sodium sulfate when g of sulfuric acid reacts with excess sodium hydroxide to produce g of sodium sulfate. First, note that the question clearly states that sodium hydroxide is the excess reagent.

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The discrepancy between the theoretical yield and the actual yield can be calculated using the percent yield, which uses this formula: To use this formula for percent yield, you need to make sure that your actual yield and theoretical yield are in the same units.

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The equation for percent yield is percent yield = actual yield/theoretical yield x %. Let me show you how this works with an actual chemical reaction. Example One. If g of CO reacts with an excess of H 2 to form 75g CH 3 OH, what is the percent yield of the reaction? The balanced equation is CO + 2 H 2 = CH 3 OH. First, determine the theoretical yield. So, ideally, grams of CaO should have been produced in this reaction. This is the theoretical yield. However, the problem tells us that only 15 grams were produced. 15 grams is the actual yield. It is now a simple matter to find percent yield.

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To determine percent yield, divide the actual yield by the theoretical yield and multiply by For this example, use the equation: 82 grams of silver / 85 grams of silver x = 96 percent. This percentage tells you the efficiency of the chemical reaction, or how good the reaction . You should be able to calculate the percentage yield of a product from the actual yield of a reaction or calculate the theoretical mass of a product from a given mass of reactant given the balanced equation for the reaction.