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Provide an explanation of the effects which are responsible for the three absorbances profile in relation to the height of the burner. Figure below shows the absorbance profile of the three elements.
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- The absorbance of an unknown dye solution is measured to be 1.06 by a spectrometer. The calibration plot of the spectrometer is provided below. What is the molar concentration of the unknown sample (in mole L)? Absorbance vs. Molarity 18 y3 67024x-0.0343 16 14 12 1 0.8 0.6 0.4 0.2 01 0.2 0.000005 00001 0000015 Concentration of solutions, mol/L 0.00002 0.000025 000003 0 163e-5 O 2.35e-6 0 163 0 235 Absorbance22. To test a spectrophotometer's accuracy, a solution of 60.06 ppm K2Cr2O7 is prepared and analyzed. This solution has an expected absorbance of 0.641 at 350.0 nm. Several aliquots of the solution produce the following absorbance values. 0.640 0.638 0.640 0.639 0.640 0.639 0.638 is there any significant difference between the experimental mean and the expected value at a 99.9% confidence level? Yes because tcal>tcritical Yes because tcaltcritical No because tcalYellow Dye Calibration Curve y = 254.78x - 0.1414 R? = 0.9792 2.5 1.5 1 0.5 0.002 0.004 0.006 0.008 0.01 0.012 Concentration(M) 3. 2. Absorbance.Q1. To determine the concentrations (mol/L) of Co(NO3)2 (A) and Cr(NO3)3(B) in an unknown sample, the following representative absorbance data wereobtained.A (mol/L) B (mol/L) 510nm 575nm5×10−1 0 0.714 0.0970 6×10−2 0.298 0.757Unknown Unknown 0.671 0.330Measurements were made in 1.0 cm glass cells.i. Calculate the four molar absorptivities: ∈A(510), ∈A(575), ∈B(510) and ∈B(575).ii. Calculate the molarities of the two salts A and B in the unknown.A student prepared four standard solutions of (NH4)2Fe(SO4)2 and measured their absorbance at 505 nm. She created a calibration plot with the best-fit line of y = 9372 x + 0.0539. She measured the absorbance of her diluted unknown sample solution as (4.69x10^-1) nm. If she prepared her diluted sample solution by diluting 10.00 mL of the original solution to a total volume of 50.00 mL with deionized water, what is the concentration of Fe2+ in her original solution? Answer in units of M. Note: Your answer is assumed to be reduced to the highest power possible.7. Fill the absorbance value below; Path length 0.4 0.6 0.8 1.0 0. 0.2 25 12.5 6.25 3.125 % T 100 50 AbsorbanceSagaar066. Standard addition was performed to determine the iron contained in Shiraz red wine from south central Australia using a flame-atomic absorption spectrometer. Absorbance (A.U.) Fe content in South Australian red wine 0.12 0.1 0.08 0.06 0.04 0.02 0 0 0.5 y = 0.0506x+0.013 R² = 0.9987 1 1.5 Concentration (ppm) 2 A) Calculate the concentration of iron in the red wine sample (in ppm). 2.5 B) How is the R² value used in linear regression? What is an ideal R2 value? What does R² value tell you? C) Should the linear regression line in the above plot go through 0,0? Yes/No D) Why does the line not go through 0,0 on the standard addition plot? 3 E) The absorbance measurement was obtained three times for each sample and averaged by the instrument. Is the %RDS more likely to be higher when the actual concentration of the sample or standard being analyzed is low or high? Why?is polar or nonpolar. Do not draw double bonds to oxygen atoms unless they are needed for the central atom to obey the octet rule. Do not include formal charges in your drawing. XeO3 polar nonpolar 826RRA 000-F 12SEE MORE QUESTIONS