Photochemical Smog Formation (NO₂ Photolysis)
NO2 → NO + O·
Visão geral
Sunlight (< 420 nm) photolyzes nitrogen dioxide to produce nitric oxide and an oxygen atom. The oxygen atom then reacts with O₂ to form ground-level ozone. Combined with volatile organic compounds from vehicle exhaust, this initiates the complex photochemical smog cycle that plagues urban areas.
Participantes
| Papel | Substância | Coeficiente | Estado |
|---|---|---|---|
| Reagente | Nitrogen Dioxide NO₂ | 1 | (g) |
| Produto | Nitric Oxide NO | 1 | (g) |
Exemplo do cotidiano
The brown haze visible over cities like Los Angeles on sunny days is photochemical smog, driven by this NO₂ photolysis.
Importância industrial
Compreender a fotoquímica do NO₂ é essencial para a regulação da qualidade do ar, o design de conversores catalíticos e o controlo da poluição urbana.
Propriedades
- Tipo
- Photochemical
- Reversível
- Não
- Energia
- Endotérmico
- ΔH
- 305,0 kJ/mol
Reações relacionadas
Cis-Trans Isomerization of Retinal
Silver Chloride Photodecomposition
Luminol Chemiluminescence
Firefly Bioluminescence (Luciferin Oxidation)
Photolysis of Water (Vacuum UV)
Photodegradation of Methylene Blue by TiO₂
Photodissociation of Chlorine Gas
Silver Bromide Photodecomposition
Photosynthesis
Chlorophyll Fluorescence
Frequently Asked Questions
What is the equation for Photochemical Smog Formation (NO₂ Photolysis)?
The balanced equation is: NO₂ → NO + O·.
What type of reaction is Photochemical Smog Formation (NO₂ Photolysis)?
Photochemical Smog Formation (NO₂ Photolysis) is a photochemical reaction.
Is Photochemical Smog Formation (NO₂ Photolysis) exothermic or endothermic?
Photochemical Smog Formation (NO₂ Photolysis) is endothermic (absorbs energy). The enthalpy change (ΔH) is 305.0 kJ/mol.