Ozone Formation by UV Light
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3O2 → 2O3
Visão geral
Ultraviolet radiation (wavelength < 240 nm) splits O₂ molecules in the stratosphere. The resulting oxygen atoms combine with intact O₂ to form ozone (O₃). This Chapman cycle creates the ozone layer at 15–35 km altitude, which absorbs 97–99% of UV-B and UV-C radiation that would otherwise damage DNA.
Participantes
| Papel | Substância | Coeficiente | Estado |
|---|---|---|---|
| Produto | Ozone O₃ | 2 | (g) |
Exemplo do cotidiano
The ozone layer protects life on Earth from harmful UV radiation. Without it, rates of skin cancer and cataracts would skyrocket.
Importância industrial
O Protocolo de Montreal (1987) proibiu os CFCs que destroem o ozono. Os geradores de ozono são utilizados na purificação de água e no tratamento de ar.
Propriedades
- Tipo
- Photochemical
- Reversível
- Sim
- Energia
- Endotérmico
- ΔH
- 285,4 kJ/mol