What accelerating voltage would be needed to analyze for N2+ (MW = 28.01) using a magnetic sector mass spectrometer. The magnetic field was 0.352 Tesla and the radius of curvature was 12.2 cm (1 T = 1 Vs/m2)
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What accelerating voltage would be needed to analyze for N2+ (MW = 28.01) using a magnetic sector mass spectrometer. The magnetic field was 0.352 Tesla and the radius of curvature was 12.2 cm (1 T = 1 Vs/m2)
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- What accelerating voltage would be needed to analyze for C6H6+ (MW = 78.11) using a magnetic sector mass spectrometer, if it required 1144V to detect CO2+ (MW = 44.00)?For a drift length of 200 cm, in a time-of-flight mass spectrometer, what is the difference in arrival time between singly charged ions of m/z 66 and m/z 43 when the accelerating voltage is 3800V?The ion accelerating voltage in a particular quadrupole mass spectrometer is 5.00V.How long it will take a single charged cyclohexane ion to travel 15.0cm length of the rod assembly?Assume that the initial velocity of the ion in z direction is zero
- Calculate % transmittance if 85% of light was absorbed by an analyte sample in an UV-Vis spetrophotometric experimentWhat percent transmittance range and what absorbance range are considered to be the optimum working ranges for spectrochemical measurements?What is the molar extinction coefficient at 625 nm for this copper (II) acetate solution? How was it determined? Can the calibration curve be used to accurately predict the absorbance of 0.0150 M copper (II) acetate solution at 625? Why or why not?
- Derive the Scatchard equation for a reaction system 2P + X ↔ P2X, in which only P and P2X have measurable absorbances at the chosen wavelength. Based on this equation and the data given below, determine the values of Keq and ??2? (epsilon P2X). Assume the width of the cuvet used in all of these measurements to be 1cm, i.e., b = 1cm,and the absorbance of the blank solution to be zero. Sample# P0 (M) X0 (M) A 1 4×10-4 0 0.31 2 2×10-4 2×10-2 0.37 3 4×10-4 4×10-2 0.79A Dubosq colorimeter consists of a cell of fixed path length and a cell of variable path length. By adjusting the length of the latter until the transmission through the two cells is the same. the concentration of the second solution can be inferred from that of the former. Suppose that a plantdye of concentration 25 μg dm-3 is added to the fixed cell. the length of which is 1.55 em. Then a solution of the same dye. but of unknown concentration. is added to the second cel l. It is found that the same t ransmittance is obtained when the length of the second cel l is adjusted to 1.18 em. What is the concentration of the second solution?An absorbance calibration curve for Zn was fitted to equation A = 0.913×`Zn, ppm`. Flask 1: To the first flask, a 1.00 mL aliquot of the unknown Zn solution was diluted to 100.0 mL in a volumetric flask; the absorption intensity from this sample was measured to be A = 0.204. Flask 2: To a second flask, a 1.00 mL aliquot of the unknown Zn sample and a 1.00 mL aliquot of 10.00 ppm Zn solution were added and diluted to 100.0 mL in a volumetric flask; the absorbance of this sample was measured to be A = 0.294. Calculate the % spike recovery for the analysis and report to the nearest whole number. Hint: A=mC of the type y=mx, so C=A/m %Spike=100%((Cspike-Coriginal)/Cadded)) Cadded can be found from C1 V1=Cadded V2.
- 10.Which of the following statements regarding double beam spectrophotometers is NOT true? Why? a.The reference beam allows for automatic correction for source intensity fluctuations. b. Comparison of the power emerging from the sample and reference beams determines absorbance and transmittance. c. The reference beam allows for automatic correction for detector drift d. The reference beam is created using a stationary mirror. e. The reference beam is created using a rotating mirror.Assuming that the sample optical path length is 1 cm, find the molar absorptivity at wavelength 1 for MR- in cm-1 M-1 given the following: Absorbance at wavelength 1 = 0.322 concentration of MR= = 0.157 M concentration of HMR = 0.146 M molar absorptivity of HMR at wavelength 1 = 0.417 cm-1 M-1An ethanol solution of 3.5 mg/100 ml of compound Y (150.0 g/mol) in a 1.00 cm quartz cell has an absorbance (A) of 0.972 at λmax=235 nm. What is its molar extinction coefficient? Report your answer to the correct number of significant figures. Do not include units in your answer.©GMU 2020
