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

Chapter 21, Problem 21-13

(choose chapter or problem)

(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)