o 3/17/2016 08:00 AM 0 69.5/1003/16/2016 02:45 PM Gradebook Print Calculator Per

Question

o 3/17/2016 08:00 AM 0 69.5/1003/16/2016 02:45 PM Gradebook Print Calculator Periodic Table Question 8 of 10 Map sapling learnin sapling learning An attempt at synthesizing a certain optically active compound resulted in a mixture of its enantiomers. The mixture had an observed specific rotation of +16.4°. If it is known that the specific rotation of the R enantiomer is-38.9°, determine the percentage of each isomer in the mixturee Number R enantiomer: Number S enantiomer: Previous Give Up & View Solution e Check Answer Next Exit Y Hint

Explanation / Answer

R = +x = -38.9

S = -x = +38.9

then

Observed = x*(R) + (1-x)*(S)

16.4 = (x)(-38.9) + (1-x)*(38.9)

solve for x

16.4 = -38.9x + 38.9 - 38.9x

-38.9*2*x = 16.4-38.9

x = (16.4-38.9) / (-38.9*2) = 0.2892

R = 0.2892 *100 = 28.92%

S = 1-x = 1-0.2892 = 0.7108*100% = 71.08%

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