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**Molecular formula:** CO
**Molar mass:** 28,010 g/mol
**Information:** Carbon monoxide is a toxic, colourless, odourless and tasteless gas that is slightly soluble in water. It is lighter than air. Its toxicity is associated to a strong affinity with hemoglobin. Carbon monoxide binds to hemoglobin and prevents oxygen transfer in the organism. It arises in the combustion of carbon and organic compounds with insufficient oxygen.
**Appearance:** It is part of the exhaust gases of internal combustion engines and contributes to environmental pollution. It contributes to the formation of acid rain.
