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Table 1 The abundance of small molecules relative to water in comet Hale–Bopp as measured spectroscopically

From: Prebiotic Chemistry: What We Know, What We Don't

Compound

Abundance

H2O

100

CO

23

CO2

6

CH3OH

2.4

H2CO

1.1

NH3

0.7

CH4

0.6

HCN

0.25

HCONH2

0.02

CH3CHO

0.02

  1. Adapted from Bockelée-Morvan et al. (2000)
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