Question

Calculate the enantiomeric excess of a 0.1g sample of (R)(-) ibuprofen (optical rotation = -54.24°) with an observed rotation of -0.4009° in a 1 dm polarimetry cell, 10 mL of Ethanol. 73.92% 45.01% 88.22% 96.21% Question 8 2 pts Calculate the enantiomeric excess of a .1g sample of (R)(-) ibuprofen (optical rotation = -52.24°) with an observed rotation of -0.5009° in a 1 dm polarimetry cell, 10 mL of ethanol. 098.22% 96.21% 5.01% 0 95.88% Question 10 2 pts What is the optical purity of a sample that has 82% enantiomeric excess of one enantiomer? 82% 73% 91% 50%

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Answer 1

Conecilialidov - mass/volume 0.1710 Lengeh of polarimetry = I am = 0.01 g/mub for pure, ibuforofen specific notation for the sample, we know : -54.04. a {ajal ele me Capegue totale Ej : lo tation is (-0.4009) -0.4odq' : - 10.09% When abselued 0.017 :) Fantomene excom q uen by observed golātien x 100 740.09x109 observed gollien y 1000.09 Relalues of bure 54-24 (R) ibuprofen 75.91% when bainued rolkowa = 5009'. entrah ono 0.01 g (cal eulaled above fengin (1= I am for he sample a = [x] ee. Cat] = -0.5009. = -50*9 RC-) with bead ibuprofen specifik - -52.24 - 0.01 for frue clothon ) Enantiomeric excess , obsermed rolákien rolation of pure RE) ibuprofen'' xoo -50.09 4100% - 52.24 -9588°7 dos Optical purély = Enantiomerie excess = 82% i optical burity & he burity of one enantiomer over other amount than Enantiomerit orcers presence % CamScanner Scanne ocean prevence one euamhomer in greater amount Man

basically both optical purity and enantiomeric excess are the same