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

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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.