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A 0.1 M solution of an enantiomerically ...

A 0.1 M solution of an enantiomerically pure chiral compound (A) has an observed rotation of 0.20 in a 1 dm sample tube. The relative molecular mass of the compound is 150.
What is the specific rotation of A ?

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The specific rotation is the same, by definition, this parameter is independent of concentreation.
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