Bright-Line Spectra lithium cadmium strontium mixture 750 700 650 600 550 500 450 400 Wavelength (nm) What element(s) are found in the unknown mixture?
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- A 50.0 mg sample was dissolved in acid and then diluted to a total volume of 50.00 mL. If 1.000 mL ofthis solution was then diluted to 50.00 mL with water. If this diluted solution had a transmittance of 0.275 at520 nm, what is the concentration of KMnO4 in ppm in this diluted solution, assuming no interference fromother species at this wavelength?. A sample of cobalt is to be determined using absorption spectrum analysis. A 0.286 g sampleof a cobalt ore is crushed and digested in 1M HNO3. The stock solution is then diluted to 250.0mL in a volumetric flask (assuming the solution has a density = 1.00 g/mL). The analysis thenproceeds as follows: Sample Solution Std Co solution (11.2 ppm) Final Volume Transmittance 15.0 mL 0.00 mL 100.0 mL 54.1% 15.0 mL 5.00 mL 100.0 mL 19.9%Calculate the percent cobalt in the original ore sample.A solution with a known concentration equal to 3.4 mM gave an absorbance reading of 0.820 in a spectrophotometer. Assuming that there isa linear relationship between concentration and absorbance up to a concentration of 4.0 mM, what would the absorbance reading be for asolution with a concentration 1.5 mM?
- Calculate the volume of liquid in the NMR tube sketched below. Give your answer in microliters, and round to the nearest 10μL . 2.7mm--width 2.87cm--Lenght μLThe frequency factor is 8.3×10⁸dm³which of the following statements is incorrect? A. a conventional mass spectrometer does not use a spectrophotometric detectorB. a conventional mass spectrometer does not always require high purity samplesC. a mass spectrum shows no signals due to uncharged speciesD. a conventional mass spectrometer uses high energy UV radiation
- what is the frequency of light in Hz, with a wavelength of 489.1 nm? USE CORRECT ROUNDING AND SIG FIGSIn a mass spectrometer, two beams of singly ionized isotopes of uranium 23592U and 23892U are injected with velocity 1.4*105m/s into a magnetic field of strength 0.7 T normally. Compute the distance d between the two trace lines of the isotopes after they complete one semi-circle. (Given: masses of the isotopes are m235 = 3.9*10-25 kg and m238 = 3.95*10-25) a) 1.26 cm b) 0.63 cm c) 0.32 cm d) none of these.A spectrophotometer has basic several components. Describe the role of each component and the justification for the setup of an instrument used for excitation spectroscopy and an instrument for emission spectroscopy.
- What value of absorbance corresponds to 45.0% T? If a 0.010 M solution exhibits 45.0% T at some wavelength what will be the percent transmittance for a 0.020 M solution of the same substance?A solution with a known concentration equal to 3.4 mM gave an absorbance reading of 0.820 in a spectrophotometer. Assuming that there is a linear relationship between concentration and absorbance up to a concentration of 4.0 mM, what would the absorbance reading be for a solution with a concentration 2.2 mM?Fish-liver oil is a good source of vitamin A, which is mea-sured spectrophotometrically, after correcting for background, ata wavelength of 329 nm.(a) Suggest a reason for using this wavelength.(b) In what region of the spectrum does this wavelength lie?(c) When 0.1232 g of fish-liver oil is dissolved in 500. mL of sol-vent, the absorbance is 0.724 units. When 1.67X10⁻³g of vita-min A is dissolved in 250. mL of solvent, the absorbance is 1.018 units. Calculate the vitamin A concentration in the fish-liver oil