Question

In other words, you do not need to identify independent regioisomers if they are not resolved in the GC-trace. Provide a % yield calculation for the major product obtained after recrystallization.

a) ( textMass of major producttextTotal mass of reactants × 100% )

b) ( textMass of major producttextMass of minor product × 100% )

c) ( textMass of major producttextTheoretical yield × 100% )

d) ( textTheoretical yieldtextActual yield × 100% )

Answer 1

The correct formula for percent yield is: Percent Yield = (actual yield/theoretical yield) × 100%. It measures the efficiency of a chemical reaction and purity of its products, with yields occasionally exceeding 100% due to impurities.

Step-by-step explanation:

The percent yield of a chemical reaction is a comparison between the amount of product actually obtained (actual yield) and the amount that would be obtained if the reaction went perfectly (theoretical yield). The correct formula for calculating percent yield is: Percent Yield = (actual yield/theoretical yield) × 100%. This calculation is crucial, as it helps chemists understand the efficiency and effectiveness of the reaction, and in identifying any potential impurities or errors in the process.

Though it is rare, a percent yield can exceed 100% if the product contains impurities that increase its mass beyond what the theoretical yield predicts. It's worth noting that in the laboratory and industry, there is a constant effort to maximize yield and purity to make processes economically viable and environmentally friendly. Rigorous purification steps are taken to ensure that the product obtained is as pure as possible.