Calculate the e.e. and the specific rotation of a mixture containing 6 g of (+)-

Question

Calculate the e.e. and the specific rotation of a mixture containing 6 g of (+)-butan-2-ol and 4 g of (-)-butan-2-ol. The rotation of the (+) pure enantiomer is +13.5 degrees).

When one of the enantiomers of butan-2-ol is placed in a polarimeter, the observed rotation is 4.05 degrees counterclockwise. The solution was made by diluting 6 g of butan-2-ol to a total of 40 mL, and the solution was placed into a 200-nm polarimeter tube for the measurement. Determine the specific rotation for this enantiomer of butan-2-ol.

Explanation / Answer

Since it is levorotatory, this must be (

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