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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Question
Chapter 34, Problem 34.2QAP
Interpretation Introduction
Interpretation:
Themain problem associated with size analysis of particles is to be described.
Concept introduction:
Most commonly particles are represented in the form of spheres and have an equivalent volume with the sphere. Based on volume and other parameters many graphs can be determined for particle distribution
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Why do we need to determine the particle population and average particle size of a sample by the case of a screen analysis?
The velocity selector in the problem prior to this one is used in a mass spectrometer. Protons(with zero neutrons) are the most common hydrogen nuclei. Some hydrogen isotopes, however, haveeither one or two neutrons in addition to the proton. If a beam of hydrogen nuclei is shot into amagnetic eld of strength 2.0T and the nuclei do a u-turn after which they strike a detector, how farapart will the three isotopes be on the detector surface? Assume both protons and neutrons have amass of 1:67 10?27kg and e = 1:60 10?19C.Cont.
The mean particle size by number is? and The mean particle size by mass is? Use the given data
on the table below.
Size range (um): 50
150
200
55 45
20 5 0
Relative mass:
0 0.0039 0.0329 0.1393 0.1051 0.2507 0.3058 0.1625 O
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Principles of Instrumental Analysis
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