Photolysis of Water (Vacuum UV)
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H2O → H· + OH·
Visão geral
Vacuum UV radiation (< 185 nm) directly dissociates water molecules into hydrogen and hydroxyl radicals. This reaction is significant in atmospheric chemistry on Mars and early Earth, where the photolysis of water vapor contributed to the loss of hydrogen to space and the oxidation of surface minerals.
Participantes
| Papel | Substância | Coeficiente | Estado |
|---|---|---|---|
| Reagente | Water H₂O | 1 | (g) |
Exemplo do cotidiano
Mars lost most of its water over billions of years partly because UV photolysis split water vapor in the upper atmosphere.
Importância industrial
A fotólise de água por UV de vácuo é utilizada no tratamento de água ultrapura para fabrico de semicondutores e na simulação de ambientes espaciais.
Propriedades
- Tipo
- Photochemical
- Reversível
- Não
- Energia
- Endotérmico
- ΔH
- 498,0 kJ/mol