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- Calculate the resolution required to resolve the following peaks; i) CH3N+ (MW = 28.0187) and N2+ (MW = 28.0061) ii) C2H4+ (MW = 28.0313) and CO+ (MW = 27.9949) iii) C3H7N3+ (MW = 85.0641) and C5H9O+ (MW = 85.0653) iv) 116Sn+ (At W = 115.90219) and 232Th2+ (At W = 232.03800)Below is given the FT-IR (Fourier Transform Infra Red) data of a 1:1 (by weight) mixture of ethylene carbonate (EC) and dimethyl carbonate (DMC). Absorbance Pis given as a function of wavenumber, m. Regress the above data to a second order polynomial P = a, + a, m+ az m? Find the absorbance at m = 1000 cm-1 Wavenumber, m Absorbance, P (arbitrary unit) ( cm-1) 804.184 0.1591 827.326 0.0439 846.611 0.0050 869.753 0.0073 889.038 0.0448 892.895 0.0649 900.609 0.1204How to get coupling constants from this spectra. Values at the top are in ppm. The instrument is 300 MHz.
- Please answer subparts iv, v and viplease answer subparts 4,5,6Record your absorbance data for the YELLOW and RED dyes below. Calculate the dye concentration in mM for each cuvette using M1V2 = M2v2 . Remember the concentration of stock solutions (100^ % dye) is 0.020 mM(mM= millimolar =mm /L). Data for YELLOW: peak absorbance used on spectrophotometer =420nm Cuvette 1 - 100% dye = 0.680 absorption Cuvette 2 - 75% dye = 0.510 absorption Cuvette 3 - 50% dye = 0.340 absorption Cuvette 4 - 25% dye = 0.170 absorption Data for RED - peak absorption used on spectrophotometer = 500nm Cuvette 1 - 100% dye: 0.621 absorption Cuvette 2 - 75%: 0.466 absorption Cuvette 3 - 50% dye: 0.311 absorption Cuvette 4 - 25% dye: 0.1555 absorption
- Out of the indicated hydrogen molecules, which one would you expect to have the greatest downfield chemical shift on a 1HNMR spec?Potassium dichromate and potassium permanganate have overlapping absorptionspectra in 1M H2SO4 . K2Cr2O7 has an absorption maxima at 440 nm, and KMnO 4 has a band at 545nm (the maximum is actually at 525 nm, but the longer wavelength is generally used whereinterference from K2C2O7 is less). A mixture is analyzed by measuring the absorbance at these twowavelengths with the following results: A 440 =0.405, A 545 =0.712 in a 1-cm cell. The absorbances ofpure solutions of K2Cr2O7 (1x10 -3 M) and KMnO 4 (2.00x10 -4 M) in 1 M H 2 SO 4 , using the same cell gavethe following results: A Cr,440 = 0.374, A Cr,545 = 0.009, A Mn,440 =0.019, A Mn,545 = 0.475. Calculate theconcentrations of dichromate and permanganate in the sample solution.Concentration [M] Absorbance Solution 1 86.29 0.64 Solution 2 51.986 0.29 …. Fig 1: [graph of the calibration curve, make sure to show: function, R2, 0 intercept]
- What is the name of the standard that defines zero on the chemical shift axis? (The standard must be a molecule with protons in only one type of environment.) -Tetramethylsilane -Propanoic acid -Ethanol -ButaneExplain why the information from an XPS chemical shift must also be contained in an X-ray absorption edge.Please answer subparts vii, viii, and ix