If a mixture has an ee of 30%, what is the percentage enantiomer) of each enantiomer? (ee = excess Select one: OA. 85%: 15% OB. 70% 30% O C. 75%: 25% O D. 65%: 35%

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**Question:**

If a mixture has an ee of 30%, what is the percentage of each enantiomer? (ee = excess enantiomer)

**Options:**

- A. 85% : 15%
- B. 70% : 30%
- C. 75% : 25%
- D. 65% : 35%

**Explanation:**

Enantiomeric excess (ee) is a measure of the purity of an enantiomer in a mixture. It represents the percentage difference between the two enantiomers in a chiral mixture. To determine the percentage of each enantiomer when the ee is known, consider that the mixture contains more of one enantiomer than the other by the amount of the ee percentage.

**Example Calculation:**

Given an ee of 30%, this indicates that one enantiomer exceeds the other by 30%. If the mixture is divided, 50% would be a racemic mix (equal parts of each enantiomer). Thus:

- The percentage of the major enantiomer = 50% + (ee/2) = 50% + 15% = 65%
- The percentage of the minor enantiomer = 50% - (ee/2) = 50% - 15% = 35%

Therefore, the correct answer is:

- D. 65% : 35%
Transcribed Image Text:**Question:** If a mixture has an ee of 30%, what is the percentage of each enantiomer? (ee = excess enantiomer) **Options:** - A. 85% : 15% - B. 70% : 30% - C. 75% : 25% - D. 65% : 35% **Explanation:** Enantiomeric excess (ee) is a measure of the purity of an enantiomer in a mixture. It represents the percentage difference between the two enantiomers in a chiral mixture. To determine the percentage of each enantiomer when the ee is known, consider that the mixture contains more of one enantiomer than the other by the amount of the ee percentage. **Example Calculation:** Given an ee of 30%, this indicates that one enantiomer exceeds the other by 30%. If the mixture is divided, 50% would be a racemic mix (equal parts of each enantiomer). Thus: - The percentage of the major enantiomer = 50% + (ee/2) = 50% + 15% = 65% - The percentage of the minor enantiomer = 50% - (ee/2) = 50% - 15% = 35% Therefore, the correct answer is: - D. 65% : 35%
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