Optical activity calculations | Stereochemistry | Organic chemistry | Khan Academy

How to calculate specific rotation and % enantiomeric excess.
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[@arnavagarwal7871]

For concentration shouldn't you have taken moles/volume and not weight given / vol ?

[@LinhTruong-jk8zq]

Thank you so much for this helpful video

[@miguellabradornaipal7469]

thx so much 4 ur help

[@alisonm8319]

Thank you 😭💙

[@lokesh217]

It looks to me that calculation is wrong. It has c=2 g/100 mL, and value of specific rotation should be -0.315.

[@michaeldepauw7446]

Actually, his calculation is correct. The concentration for calculations of specific rotation is supposed to be measured in g/mL, not g/100mL. As such, the specific rotation will be -31.5 degrees.