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15.8 The predicted intensity of the M+1 peak for butane is 4.4% and that for acetone is 3.3%. The intensities of these two peaks are similar and probably could not be used with confidence to distinguish between these compounds. 15.9 a) M : M+2 : M+4 = 0.67 : 0.11 (9:6:1) b) M : M+2 : M+4 = 1: 1.33 : 0.33 (3:4:1) 15.10 a) The similar intensities of the (m/z 164) and the M+2 (m/z 166) peaks indicate that there is one Br is present in this compound. b) The appearance of the molecular ion at odd m/z (73) indicates the presence of an odd number of nitrogens in the compound. 15.11 H + a) b) + H 15.12 + a) CH₃CH₂CH₂ + . CH₂CH₃ m/z 43 + CH₃CH₂CH₂ + CH₂CH₃ m/z 29 CH₃ CH₃ CH₂ CH₂ b) CH₃CH₂CH + CH₂CH₃ + m/z CH₃ CH₂ + CH₃CH₂CH + CH₂CH₃ . m/z 29 227