Question: Formaldehyde has a nominal (integer) mass of 30 Da, 30 Da, but its mass spectrum in Figure 22-7 has seven peaks at different values of

Formaldehyde has a nominal (integer) mass of 30 Da, 30 Da, but its mass spectrum in Figure 22-7 has seven peaks at different values of m/z m/z. Explain the origin of each peak. Draw a Lewis dot structure of each ion to decide which ones have an unpaired electron.

Figure 22-7

Relative abundance 100 Electron ionization mass spectrum of formaldehyde H 90 80

Relative abundance 100 Electron ionization mass spectrum of formaldehyde H 90 80 70 60 50 40 30 20 10 0 0 H 5 =0 CH CH 12131415 HCO 15 C+ I 10 m/z 20 29 HCO+ 25 HCO = M** 30 H13CO** 31 30 35

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