Principles of Instrumental Analysis
7th Edition
ISBN: 9781305577213
Author: Douglas A. Skoog, F. James Holler, Stanley R. Crouch
Publisher: Cengage Learning
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Chapter 31, Problem 31.11QAP
Describe the difference between power-compensated, heat-flux, and modulated DSC instruments.
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Percent Transmittance
0.4
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0.2
0.15
0.1
0.05
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3500
3000
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neighbours. The relative intensities, I, of the detected beam of Kr atoms for
two different temperatures and at a series of rotation rates were as follows:
v/Hz
20
40
80
100
120
I (40 K)
0.846
0.513
0.069
0.015
0.002
I (100 K)
0.592
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Principles of Instrumental Analysis
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- Calculate the temperature at which qvib 4.0 -.6806 X K 2.5 for nitric oxide. The vibrational wavenumber isỹ = 1876 cm-1.arrow_forwardA sample of pure 1 H79Br gas was analysed using IR and NIR absorption spectrometers. A fundamental vibration at 2575.15 cm–1 and an overtone band at 5022.78 cm–1 were measured. (a) Using this data, calculate the equilibrium oscillation frequency (in cm–1) and the anharmonicity constant ( e x ) for pure 1 H79Br.arrow_forwardWhat is the physical origin of the specific selection rule ΔJ= ±1arrow_forward
- Please what molecule is thisarrow_forwardQUESTION 5 The IR, 'H NMR and 1°C NMR spectra of compound P are shown below. The molecular formula for compound P is CsH;NO2. Identify three (3) important absorption peaks on the IR spectrum and indicate the bond and wavenumber associated with each peak. Elucidate the structure of compound P and assign each peak in the 'H and 13C NMR spectra. (Hint: The compound consists of more than one functional group). а. b.arrow_forwardEstimate the centrifugal distortion constant for 79Br81Br, for which ᷉ B = 0.0809 cm−1 and ᷉v = 323.2 cm−1. By what factor would the constant change when the 79Br is replaced by 81Br?arrow_forward
- Isoamyl acetate 100 90 80 70 60 50 40 20 10 4000 3500 3000 2500 2000 1500 1000 500 wave number(cm-1) Band Intensity Assigned to the link Frequency (cm") Vibrational mode W M S % de transmittancearrow_forwardoutline the general procedure for determining a substance spectrophotometricallyarrow_forwardFor 1H35Cl molecule, (N1/N0) ratio at 300 K is 6.091 x 10-2. Calculate thewavenumber ( in cm-1) for J=2→J=3 transition in the microwave spectrum of the molecule.arrow_forward
- a) Make A grouped frequency distribution of the data 4,16,32,52,56,62,73,81,83,88,94,100,102,110,138,152,165,173,176,184,186,202,204,207,209,223,229,238,248,249,262,264,270,272,279,281,285,287,293,296,305,309,314,320,321,323,337,353,356,360,362,366,371,373,381,393,395,398,403,407,418,419,426,429,433,434,435,444,446,447,450,451,469,486,508,513,521,522,524,529,533,538,544,551,554,558,560,561,562,572,596,607,609,621,624,652,657,660,677,695,701,702,712,713,718,724,726,740,750,764,765,766,773,778,781,785,786,795,816,857,861,864,873,874,876,885,888,894,899,900,901,912,913,918,920,933,941,944,945,957,961,962,965,969,972,982,983,990,991,996 b) Draw Histogram for the frequency distribution table madearrow_forwardEstimate the centrifugal distortion constant for 1H127I, for which ᷉ B = 6.511 cm−1 and ᷉v = 2308 cm−1. By what factor would the constant change when 2H is substituted for 1H?arrow_forward-1 56 The first three Stokes lines in the rotational Raman spectrum of ¹0₂ are separated by 14.4 cm¹, 25.8 cm¹ and 37.4 cm from the exciting radiation. Using the rigid rotor approximation obtain a value for ro.arrow_forward
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