For the given ee values, calculate the percentage of each enantiomer present.

a. 90% ee

b. 99% ee

c. 60% ee

The enantiomeric excess comes to explain the particular enantiomer’s excess amount in the given mixture.

The formula to calculate the ee is as follows:

$\text{ee=\%ofoneenantiomer-\%ofotherenantiomer}$

a. From the formula of ee, we can easily calculate the percentage of enantiomers as:

90% ee means 90% excess of A, and 10% racemic mixture of A and B (5% each); therefore, 95% A and 5% B.

Therefore, the percentage of enantiomers is 90 % of A and 5% of B.

b. From the formula of ee, we can easily calculate the percentage of enantiomers as:

99% ee means 99% excess of A, and 1% racemic mixture of A and B (0.5% each); therefore, 99.5% A and 0.5% B.

Therefore, the percentage of enantiomers is 99.5 % of A and 0.5% of B.

c.From the formula of ee, we can easily calculate the percentage of enantiomers as:

60% ee means 60% excess of A, and 40% racemic mixture of A and B (20% each); therefore, 80% A and 20% B.

Therefore, the percentage of enantiomers is 80 % of A and 20% of B.