a b a: 6.5-8 ppm, 1H, doublet b: 6.5-8 ppm, 1H, triplet c: 6.5-8 ppm, 1H, doublet d: 2-3 ppm, 3H, singlet e: 2-3 ppm, 2H, triplet f: 0-2 ppm, 2H, quintet g: 0-2 ppm, 3H, triplet CI Br `OH H3CO
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- You have a Compound A which over time decomposes into Compound B. By performing a UV-Vis test at a length of 600 nm wave to a solution of A at a concentration of 120 mg/L, gave 0.98 transmittance and at 520 nm gave 0.61, this in a cell 1 cm long; The same test was made to compound B at a concentration of 20 mg/L, resulting in 0.25 of transmittance at 600nm and 0.72 transmittance at 520 nm. 2.5 grams of sample were taken and diluted in 25 milliliters, and UV spectroscopy was performed in a 1cm cell, giving as result at 600 nm 0.52 transmittance and at 520 nm 0.44. What is the percent decomposition in grams of Compound A?1. True or False a. UV-Vis spectroscopy normally reports data in the from of bands rather than single peaks because of overlapping electronic transitions that are being recorded by the detector. (T/F) b. When using linear regression to translate absorption data using Beer's Law, the y-intercept (+b) of the linear equation represents the path length. (T/F) c. Phosphorescent materials give a glowing effect because the electrons remain at an excited state for much longer, which is the cause for the "glow". (T/F)Propose a structure consistent with each set of data. a.C9H10O2: IR absorption at 1718 cm−1b.C9H12: IR absorption at 2850–3150 cm−1
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- The molar absorptivity of 2,5-dimethyl-2,4-hexadiene in methanol is 13,100 M-1cm-1. What concentration of this diene in methanol is required to give an absorbance of 1.6? Assume a light path of 1.00 cm. Calculate concentration in these units. Q.) Moles per literAs part of an investigation on Pb in biological ecosystems, some grasses that grew along the road and were exposed to emissions from motor gasoline were collected. 6.2501 g of grass were calcined to destroy all organic matter, the inorganic residue was properly treated and finally made up to 100 mL. An aliquot of 50 mL of this solution was read in an atomic absorption spectrophotometer registering an absorbance of 0.1250; then 0.10 mL of a standard solution of 55 µg of Pb / mL were added to the other 50 mL, with this fortified sample, another absorbance measurement was made, which was 0.1798. Calculate the µg of Pb / g of grass1.) Which solutions should you have used to make your Beer's Law Plot? 2.) What property of the product of your reaction allowed you to use visible spectroscopy to analyze your results? 3.) Using your absorbance value from Equilibrium mixture 5 (E5), show your calculation for the concentration of FeSCN^2+ in sample E5. (Provided picture for the resources)
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