Sometimes the 1-phenylethylamine tartrate salt crystallizes as fine needles rather than the desired prisms. The 1-phenylethylamine recovered from these needles has been found to have a specific rotation of -20.1 degrees. What percent of (-)-1-phenylethylamine is this amine mixture? What is the percent of (+)-1-phenylethylamine?

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do you have the data of the light rotation of the mixture?

[a]D of pure (-) 1-phenylethylamine is -40.2 degrees

actually 3/4
and 1/4
3/4 x -40 = - 30
1/4 x 40 = 10
= -20

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