a. Figure 22-27 is a high-resolution mass spectrum with a parent ion C8H11N4O2+ C 8 H 11

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a. Figure 22-27 is a high-resolution mass spectrum with a parent ion C8H11N4O2+ C8H11N4O+2 at m/z 195.087 55. m/z 195.087 55. Isotopic masses in Table 22-1 give m/z=195.087 63m/z = 195.087 63 for this formula. The difference of 0.000 08 0.000 08 is due mainly to using isotopic masses published at different times and partly from rounding of mass to five decimal places in Table 22-1. Write the formulas of the four isotopologues with nominal mass 197 197 in the middle spectrum of Figure 22-27.

b. From Table 22-2, predict the relative sizes of the two largest peaks C128H111N144O18O16+12C81H1114N418O16O+ and C132C126H111N144O162+.13C212C61H1114N416O+2. Does the observed spectrum agree with your prediction?

Figure 22-27

Table 22-1

Table 22-2

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Quantitative Chemical Analysis

ISBN: 9781319164300

10th Edition

Authors: Daniel C. Harris, Charles A. Lucy

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