A sample of synthetic camphor contains both d and l isomers in unequal amounts. The specific rotation of the sample is found to be -13.9. What is the enantiomeric excess of the sample??

Dear Sohan,

since it have -ve sign, it mean degre of polrization is more towards anticlockwise direction. 
d - for clockwise, l - for anticlock wise.
It means l- isomers is in excess of sample.

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