I have a solution of a standard reference molecule and its' enantiomer.  I used 25 mg of the mixture and dissolved it in 30 mL of solvent. The pathlength of my tube is 65cm.  The specific rotation of the reference material is 100.  For my sample, i got+0.25 degrees.  How much of my reference molecule is in the solution in % and mg?

1. Given the IR and MS spectra, identify the following unknown with molecular formula (C5H10). 0.9 0.75 0.6 0.45 3089 2975 3000. 1648 2000. WAVENUMBER (cm-1) 885 1000. 100.- 80. 60.- 40.- 20. 0. 0. 15 15. d. Propose a structure consistent with this information. 29 c. To what do MS fragments at m/z = 70, 55, and 29 correspond? 30. m/z a. Calculate the hydrogen deficiency index for the molecule (show your work). 45. b. To what do the IR absorptions at 3089, 2975, 1648, and 885 cm³¹ correspond? 60. 70 75.

Dr. VMV weighed out 1.02 g of menthol and dissolved it into 10.0 mL of absolute ethanol in a 10.0 mL volumetric flask. The optical rotation for this solution was obtained in a cell with a 50 mm optical path length, found to be -2.508°, using the Na D-line at 25.1 °C. What is the specific rotation?

[References] All ethyl esters of long-chain aliphatic acids (for example, ethyl tetradecanoate, C13H27COOCH₂CH3) show significant fragment ions at m/z 88, 73, and 45. Draw the structure of the ion that gives the m/z 88 peak. star 14