The specific rotation of (s)-2-butanol is +13.5. if 0.119 g of its enantiomer is dissolved in 10.0 ml of ethanol and placed in a sample cell with a length of 1.00 dm, what observed rotation do you expect?

+15.8°

Explanation:

The formula for the observed rotation (α) of an optically active sample is

α = [α]lc

where

l = the cell path length in decimetres

c = the concentration in units of g/100 mL

[α] = the specific rotation in degrees  

1. Convert the concentration to units of g/100 mL

2. Calculate the observed rotation

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