From the information in Table 12.3, predict the appearance of the molecular ion peak(s) in the mass spectrum of chloromethane. (Assume that the molecular ion is the base peak.)
Table 12.3

TABLE 12.3 Exact Masses and Isotopic Abundances of Several Isotopes Important in Mass Spectrometry Element Isotope Exact mass Abundance, % 99.985 0.015 hydrogen 1.007825 2.0140 12.0000 13.00335 98.90 1.10 carbon 14.00307 15.00011 99.63 0.37 nitrogen 15 15.99491 16.99913 17.99916 99.759 0.037 0.204 Oxygen 0 fluorine 18.99840 100. 27.97693 28.97649 29.97377 92.21 4.67 3.10 silicon 31 phosphorus 30.97376 100. 2s 33s 31.97207 32.97146 33.96787 sulfur 95.0 0.75 4.22 34.96885 36.96590 75.77 24.23 chlorine 50.69 49.31 bromine 78.91834 80.91629 odine 1271 126.90447 100. 2H is commonly known as deuterium, abbreviated D.