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- #9. Use the information provided below to find out the molecular formula and structure of the compound. QE-300 CDCl3 al Relative Intensity 100 80 60 40 20 +0 0-min 10 3454 #1 3456 57 2907 15 2944 20 2910 36 2879 50 TO ALLE 1 In 20 30 2716 81 2001 04 2438 1 2154 84 1991 84 1972 77 1733 4 1476 23 1470 25 1447 19 1421 16 1116 25 1160 9 40 50 1306 1270 1140 1022 9 974 27 657 25 76466 6 $ 60 m/z MENYERL 70 722 27 608 13 1900 80 90 100 110 120You measured the carbon-carbon bond lengths of four different compounds in Experiment 8 (Molecular Modeling and IR spectroscopy). Which of the following compounds has the shortest average C-C bond length? Benzene Cyclohexene Cyclohexane O Cyclohexadiene Which of the following statement(s) is(are) true? Select all that apply: When two atoms are bonded together, the distance between atoms is the same all the time. In the IR spectrum, carbonyl groups (C=O) have strong sharp peaks ranging from 1700 cm 1 to 1750 cm-1. When a molecule absorbs an IR radiation, electrons are excited within the molecule and each absorbed electron creates a band in the molecules IR spectrum. IR spectroscopy is useful in confirming the structure of the analyzed compound. Molecule N2 does not absorb IR radiationI'm having trouble to solve L.
- ica O CHEM-3A-81091-2... ead W ical Part A PCl5 (g) PC13 (1) + Cl2(g) Use A for [PC15], B for [PC13], C for [Cl2]. ΜΕ ΑΣΦ Keq AC1.8 Submit Previous Answers Request Answer × Incorrect; Try Again; 3 attempts remaining Part B 2KNO3(s) = 2KNO2 (s) + O2(g) Use A for [KNO3], B for [KNO2], C for [02]. Keq = ΜΕ ΑΣΦ Submit Part C Request Answer Pollen tomorrow ? ?5. Hence show that: OU (hv exp(-ẞhv)) hv exp(-2ẞhv) =-3Nhv + oß (1-exp(-ßhv)) (1-exp(-ẞhv)) Hint 1: you will need to use the quotient rule: yf'(x) xf'(y) f'(x) f'(y) (f'(y))² (f'(y))² Hint 2: the following identity will avoid you having to use the chain rule: d (1 − e√(x)) = − f'(x)e√(x) dxHalogenated compounds are particularly easy to identify by their mass spectra because both chlorine and bromine occur naturally as mixtures of two abundant isotopes. Recall that chlorine occurs as 35Cl (75.8%) and 37Cl (24.2%); and bromine occurs as 79Br (50.7%) and 81Br (49.3%). At what masses do the molecular ions occur for the following formulas? What are the relative percentages of each molecular ion? (a) Bromomethane, CH3Br (b) 1-Chlorohexane, C6H13Cl
- Ater analyzing a mass spectrum you conclude that the molecule being analyzed has the molecular formula C4H8; however, there are five possible constitutional isomers with that same molecular formula. the only thing that stands out in the mass spectrum is a strong fragment signal at m/z=41. Determine the possible constitutional isomers for C4H8 and explain which isomer matches the mass spectrum.Why do aldehydes, esters, and amides all have a strong absorption in the 1630-1780 cm1 region of their IR spectra? A) The bond between H and the sp³-hybridized C in these functional groups vibrates in this energy range. B) Each of these functional groups has at least two resonance structures, and the different vibrations of the resonance structures give off energy in this region. C) The bond between O and the sp²-hybridized C in these functional groups vibrates at a frequency in this energy range. D) Light at this wavenumber causes the average C to O bond length to increase which causes more of this light to be transmitted. E) An electron in the bond of these functional groups gets excited to the * orbital.A mass peak at m/z = 59 appears in the mass spectrum of an amide, C5H11NO. Draw the structure of a molecule that is consistent with this result.
- The leaves of the Brazilian Tree Senna multijunga contain a number of pryidine alkaloids that inhibit acetylcholinterinase. Two recentyl isolated isomeric compounds have the strcture have the strcture shown below. (NOTE: M=293) Use the mass spectral data provided to determine the precise location of the hydroxyl group in each isomer. Isomer A: EI-MS, m/z(rel. int): 222(20), 150(10), 136(25), 123(100) Isomer B:EI-MS, m/z(re;. int): 236(20), 150(10), 136(25), 123(100)Ibuprofen, 2-[4-(2- methylpropyl)phenyl]propanoic acid, is a medication used to reduce pain, fever, or inflammation. It is slightly soluble in pure water but well soluble in alcohols. From the formula of this molecule, is it possible to determine this molecule spectrophotometrically in solution without adding any reagents? Explain why yes or why not. CH3 CH3 но H3C[References] The mass spectrum of octanoic acid, CH3(CH2)6COOH, exhibits a series of peaks differing by 14 amu at m/z 29, 43, 57, 71, 85, and 99. Draw the structure of the fragment resulting in the m/z 71 peak. • You do not have to consider stereochemistry. • You do not have to explicitly draw H atoms. • In cases where there is more than one answer, just draw one. • Do not use the square brackets tool in your answer. opy aste H,C earch 84%
