7 11 8 9 11 11 12 13 14 15 16 17 18 ✓ ✓ 19 20 21 ✓ -- 22 23 24 25 26 27 10 < Light was measured to have a frequency of (7.93x10^3) Hz. What was the wavelength in mm? c = 3.00 x 108 m/s 1 Hz = 1 s 1 Be careful with your units!!! For full credit: • Enter your answer with 3 significant figures . Put it in scientific notation. . Include the correct units Note: Your answer is assumed to be reduced to the highest power possible. Your Answer: x10 units MacBook Air Answer

7 11 8 9 11 11 12 13 14 15 16 17 18 ✓ ✓ 19 20 21 ✓ -- 22 23 24 25 26 27 10 < Light was measured to have a frequency of (7.93x10^3) Hz. What was the wavelength in mm? c = 3.00 x 108 m/s 1 Hz = 1 s 1 Be careful with your units!!! For full credit: • Enter your answer with 3 significant figures . Put it in scientific notation. . Include the correct units Note: Your answer is assumed to be reduced to the highest power possible. Your Answer: x10 units MacBook Air Answer

Principles of Instrumental Analysis

7th Edition

ISBN:9781305577213

Author:Douglas A. Skoog, F. James Holler, Stanley R. Crouch

Publisher:Douglas A. Skoog, F. James Holler, Stanley R. Crouch

Chapter20: Molecular Mass Spectrometry

Section: Chapter Questions

Problem 20.16QAP

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In order to measure riboflavin in a breakfast cereal, a 5.00-gram sample of the cereal was extracted with acetic acid and filtered. The extract was transferred to a 50.0 mL volumetric flask and diluted to the mark. The sample was transferred to a cuvette and the fluorescence was measured. The instrument read 59 units (Fluorescence units –an arbitrary scale). 24.00 mL of the cereal extract was sample was mixed with 1.0 mL of a riboflavin standard that was 0.500 ug/mL. The fluorescence of this mixture was measured and read 94 fluorescence units. Calculate the concentration of riboflavin per gram of cereal (use µg/gram of cereal).
SPECTRA FOR HOMEWORK 11, CHE 230 002 This page is not to be submitted to Gradescope. Use these spectra as you answer questions on the Homework 11 document. Spectra for Problem 1 100 %T 80 60 40 20 Relative Intensity 4000 100- 80 8 60- 40- 20- 0 20 2H 2H 3000 m/z 50.0 75.0 76.0 155.0 157.0 183.0 185.0 212.0 214.0 100.0 97.5 11.8 11.7 1686 cm 40 60 80 2000 rel, intensity 11.9 16.9 17.6 28.8 27.8 Wavenumber[cm-1] 100 120 m/z 1500 7.90 7.85 7.80 7.75 7.70 7.65 7.60 7.55 1588 cm² 20 20 ₂ مسلسل..............للمسلسل ppm 140 160 180 200 220 2H 1000 3.12 3.00 2.95 2.90 3H 500 400 A. Propose a molecular formula for this compound B. Propuse. a structure selected 1.25 1.20 1.15 201
Examine the following IR spectra. Assign the characteristic peaks/vibrations (use v, 8, t, y). Then, tell (in words) all you can about the compound producing these spectra.
3. The change in frequency produced by the Doppler shift when a sound source of frequency f is moving with velocity v toward a fixed observer is given by fv Af (u-v) and v and their uncertainties, calculate Af and its uncertainty. Which, if any, of where u is the velocity of sound. From the following values of u, f, the uncertainties make a negligible contribution to the uncertainty in Af ? u = (332 ± 8) m s1; f = (1000 ± 1) Hz; and v = (0.123 ± 0.003) m s1
A beam of electrons with a speed of 600 m/s passes through double slit with the slits spaced 2 μm apart. If the detector is 2 meters away from the double slit, how far off the center will the m = 1 signal appear?
show-all-working-explaining-detailly-each-step Answer should be typewritten using a computer keyboard.
The validation process comprises four main steps that are : hardware validation, software validation, method validation and system suitability. To evaluate a spectrophotometer’s accuracy by measuring absorbance, a solution of 60.06 mg/L K2Cr2O7 in 0.0050M H2SO4 was carefully prepared together with a 0.0050 M H2SO4 as a reagent blank. If the spectrometer’s signal is properly calibrated, it has been reported that this solution should provide an absorbance of 0.640 +- 0.010 at wavelength 350 nm. Which one of the validations mentioned above had been involved in this process? Explain your choice
If w = f(P,V,T), then rðw\ dP + dw = dV + dT P.V v.T P.T O True O False
1-31. We shall learn when we study molecular spectroscopy that heteronuclear diatomic molecules absorb radiation in the microwave region and that one determines directly the so-called rotational constant of the molecule defined by B = 8721 where I is the moment of inertia of the molecule. Given that B = 3.13 × 105 MHz for H35C1, calculate the internuclear separation for H35C1. The atomic mass of H and 35C1 are 1.008 and 34.97, respectively.
Consider the reaction described by the equation C₂H₂Br₂ (aq) + 31¯¯(aq) · C₂H₂(g) + 2 Br¯(aq) + I₂ (aq) The rate law is rate = k[C₂H₂Br₂][I] where k = 0.00475 M-¹. s-¹. S What are the missing entries in the table? Run [C₂H₂Br₂lo (M) [Ilo (M) 1 0.249 2 3 X 0.249 0.249 y 0.249 Initial rate of formation of C₂H₂ (M-s¯¹) 0.00118 0.000589 Z
During your experiment, you measure the absorbance of a sample to be 1.362. You have to convert thisabsorbance to methylene blue concentration (in ppm) using the absorbance measurements of two standardsolutions of known concentration:5 ppm: Absorbance 0.55510 ppm: Absorbance 1.211What is, in ppm, the concentration of your sample? Report using 3 decimal figures. Your answer must becorrect to 0.02 ppm
! 9 a alt ← Z If you live to be approximately 83 years old, how many hours long was your life? Assume a year is exactly 365 days. @ 2 W S →> X #m 3 e d C с $ 4 r f % 5 V t g Oll A 6 DELL b y h & 7 O n u j * 00 O m i k ( 9 < 4 O alt ) O 1 P ◆ ctrl : - ; { [ ? 1 +11 = I } bac 1