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(Each part of this problem is quite long and best worked by groups of students.) Peak

Quantitative Chemical Analysis | 8th Edition | ISBN: 9781429218153 | Authors: Daniel C. Harris ISBN: 9781429218153 475

Solution for problem 21-13 Chapter 21

Quantitative Chemical Analysis | 8th Edition

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Quantitative Chemical Analysis | 8th Edition | ISBN: 9781429218153 | Authors: Daniel C. Harris

Quantitative Chemical Analysis | 8th Edition

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Problem 21-13

(Each part of this problem is quite long and best worked by groups of students.) Peak intensities of the molecular ion region are listed in parts (a)(g) and shown in the figure. Identify which peak represents the molecular ion, suggest a composition for it, and calculate the expected isotopic peak intensities. Restrict your attention to elements in Table 21-1. (a) m/z (intensity): 112 (999), 113 (69), 114 (329), 115 (21) (b) m/z (intensity): 146 (999), 147 (56), 148 (624), 149 (33), 150 (99), 151 (5) (c) m/z (intensity): 90 (2), 91 (13), 92 (96), 93 (999), 94 (71), 95 (2) (d) m/z (intensity): 226 (4), 227 (6), 228 (130), 229 (215), 230 (291), 231 (168), 232 (366), 233 (2), 234 (83) (Calculate expected intensities from isotopes of the major element present.) (e) m/z (intensity): 172 (531), 173 (12), 174 (999), 175 (10), 176 (497) (f) m/z (intensity): 177 (3), 178 (9), 179 (422), 180 (999), 181 (138), 182 (9) (g) m/z (intensity): 182 (4), 183 (1), 184 (83), 185 (16), 186 (999), 187 (132), 188 (10)

Step-by-Step Solution:
Step 1 of 3

Inorganic and organic compounds Elements = smallest substances Matter = anything that has a mass and occupies space You can take compounds and break them down into molecules and then to its individual elements. ATOMIC MODEL Protons = positive HEAVY (inside nucleus) Neutrons = no charge (neutral) HEAVY Electrons = orbit the nucleus, negative, LIGHT (EMISSION SPECTROCITY = electron emits energy as visible light *fireworks)  preferred in forensic science Atomic Absorption Spectrocity = the opposite the # of protons is the same for all atoms of the same element. In a neutral atoms the # of protons = number of electrons Number of protons = number in top left corner in periodic table for each element. Atomic number = of protons in a nucleus GROUPS AND PERIODS Isotopes 

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Chapter 21, Problem 21-13 is Solved
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Textbook: Quantitative Chemical Analysis
Edition: 8
Author: Daniel C. Harris
ISBN: 9781429218153

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(Each part of this problem is quite long and best worked by groups of students.) Peak