# Problem: The specific rotation of (S)-carvone (at 20°C) is +61. A chemist prepared a mixture of (R)-carvone and its enantiomer, and this mixture had an observed rotation of –55°.(b) Calculate the % ee of this mixture.

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###### FREE Expert Solution

We’re being asked to calculate the enantiomeric excess for a mixture of (R) and (S)-carvone with an observed rotation of –55˚. The specific rotation of (S)-carvone is +61˚.

Recall that a pair of enantiomers would rotate plane-polarized light in opposite directions. This means if the specific rotation of (S)-carvone is +61˚, the specific rotation of (R)-carvone is –61˚.

The enantiomeric excess (ee) tells us the degree to which an enantiomer is in excess than the other.

• a racemic mixture (equal amounts of enantiomer) would have ee = 0%

• a pure enantiomer would have ee = 100% ###### Problem Details

The specific rotation of (S)-carvone (at 20°C) is +61. A chemist prepared a mixture of (R)-carvone and its enantiomer, and this mixture had an observed rotation of –55°.

(b) Calculate the % ee of this mixture.

What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Enantiomeric Excess concept. You can view video lessons to learn Enantiomeric Excess. Or if you need more Enantiomeric Excess practice, you can also practice Enantiomeric Excess practice problems.

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Our tutors rated the difficulty ofThe specific rotation of (S)-carvone (at 20°C) is +61. A che...as medium difficulty.

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Based on our data, we think this problem is relevant for Professor Miessein's class at HUNTER.

What textbook is this problem found in?

Our data indicates that this problem or a close variation was asked in Organic Chemistry - Klein 1st Edition. You can also practice Organic Chemistry - Klein 1st Edition practice problems.