Question

What is the percent yield for the reaction if 50 g of hexamethylenediamine is made from 65 g of adipic acid? Percent yield = %.

a) Define and explain the concept of percent yield in the context of chemical reactions.
b) Instruct the respondent to calculate the percent yield for the given reaction involving hexamethylenediamine and adipic acid.
c) Encourage a step-by-step explanation or rationale for the calculation process, demonstrating an understanding of how to determine percent yield in a chemical reaction.

Ensure clarity in the question to prompt an accurate calculation and explanation of the percent yield for the specified reaction.

Answer 1

Percent yield is the ratio of the actual yield of a chemical reaction to the theoretical yield, expressed as a percentage. To calculate it, the theoretical and actual yields must be known. With this information, the percent yield is calculated using the formula Percent Yield = (Actual Yield / Theoretical Yield) × 100%.

Step-by-step explanation:

Defining Percent Yield

Percent yield is defined as the ratio of the actual yield to the theoretical yield, multiplied by 100. The theoretical yield is the maximum amount of product that could theoretically be obtained from a reaction, based on stoichiometric calculations from the balanced chemical equation. The actual yield is the amount of product that is actually obtained from the reaction.

Calculating Percent Yield

To calculate the percent yield, follow these steps:

1. Calculate the theoretical yield based on the reaction stoichiometry and the amounts of reactants used.
2. Determine the actual yield from experimental data.
3. Use the formula: Percent Yield = (Actual Yield / Theoretical Yield) × 100%.

For the given reaction with hexamethylenediamine and adipic acid, we are not provided with the balanced chemical equation or the stoichiometry needed to calculate the theoretical yield. However, assuming that 65 g of adipic acid should produce 50 g of hexamethylenediamine as the actual yield, the percent yield can be calculated once the theoretical yield is known.

If the theoretical yield were given or calculated to be, for example, 55 g, then the percent yield would be calculated as follows:

Percent Yield = (50 g / 55 g) × 100% = 90.9%