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- 50 uL of an aqueous sample of double-stranded DNA is dissolved in 950 uL of water. This diluted solution has a maximal absorbance of 0.326 at 260 nm. What is the concentration of the original (more concentrated) DNA sample, expressed in ug/uL?True or False 1. Sample preparation of infrared spectroscopy uses KBr as the blank because Kbr has 100% transmittance at the IR wavelength range. 2. The electronegativity difference present in a dipole moment within a bond is directly proportional to the electromagnetic field produced. 3. The electromagnetic radiation that is emitted in infrared spectroscopy is not enough to excite electrons to an unoccupied molecular orbital.Unrounded Rounded ε∗,L/μmol 0.0259825 0.0260 Heres the data if needed: TZ # Concentration Absorbance at 430 nmnm 1 33.6480 0.931 2 25.2360 0.757 3 16.8420 0.210 4 8.41200 0.137 5 4.20600 0.122
- Q. based on the graph, the absorbance of caffeine using UV-vis spectroscopy is at ________. CHOICES: A. 320 nm B. 260 nm C. 260-290 nm D. 275 nm E. 260-300 nmWhich nmr active nuclei have lowest natural abandance 15N 13C 19F 31pPredict the splitting pattern for each kind of hydrogen in isopropyl propanoate, CH3CH2CO2CH(CH3)2.
- Identify the remaining three fragments from the table. (m/z=22,16,12) (hint: for m/z=22, the value of Z isn't necessarily 1)The electronic configuration of 15 X 3- ion is a. [Ne]3s23p2 b. [Ne]3s2 c. [Ne]3s23p6 d. [Ne]3s23p1Bartleem is a chiral molecule. At 70 oC Bartleem is a liquid with a density of 0.722 g/mL. At this temperature and using a 589 nm light source with a 1 dm path length the rotation of light is found to be 71o. What is the optical rotation for Bartleem?
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