Learning Goal: To calculate theoretical and percent yields,

Last updated: 7/31/2022

Learning Goal: To calculate theoretical and percent yields, given the masses of multiple reactants. A balanced chemical reaction gives the mole ratios between reactants and products. For example, one mole of white phosphorus, P4, reacts with five moles of oxygen, O2, to produce two moles of diphosphorus pentoxide, P2O5: P4+502 2P2O5 In this example, if we know the number of moles of phosphorus, we know that twice that much product can be made, assuming we have enough oxygen. Similarly, if we know the number of moles of oxygen, we know that two-fifths that much product can be made, assuming we have enough phosphorus. In a situation where you are given the mole amounts of both reactants, you should do this type of calculation individually for each one, finding two different values for the amount of product. The smaller of these two values is the maximum amount of product that can be made, also known as the theoretical yield. If you are given the masses of the reactants, you will first have to convert to moles. Once you have mole amounts, you can follow the procedure described above, applying the ratios shown in the balanced chemical equation. ✓ Correct This value is called the theoretical yield. It represents the maximum mass that could be produced if the reaction goes to completion. Percent yield If you were to perform this reaction in a lab, you would make far less than the theoretical yield of product due to a wide range of outside factors. We can compare the actual yield to the theoretical yield to calculate the percent yield: ▼ Part D percent yield = Keep in mind that the percent yield can be calculated using any unit of mass or moles, so long as they are the same. For example, you can divide moles by moles, or grams by grams, but you cannot divide moles by grams or vice versa. 0 What is the percent yield if the actual yield from this reaction is 299 g ? Express your answer to three significant figures and include the appropriate units. ► View Available Hint(s) μA Value Cubmit Review I Constants I Periodic Table actual yield theoretical yield Units x 100% ?