Photochemical Smog Formation (NO₂ Photolysis)

NO2 → NO + O·

Übersicht

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.

Teilnehmer

Rolle Substanz Koeffizient Zustand
Reaktant Nitrogen Dioxide NO₂ 1 (g)
Produkt Nitric Oxide NO 1 (g)

Alltägliches Beispiel

The brown haze visible over cities like Los Angeles on sunny days is photochemical smog, driven by this NO₂ photolysis.

Industrielle Bedeutung

Understanding NO₂ photochemistry is essential for air quality regulation, catalytic converter design, and urban pollution control.

Eigenschaften

Typ
Photochemical
Reversibel
Nein
Energie
Endotherm
ΔH
305,0 kJ/mol

Verwandte Reaktionen

Photochromism of Spiropyran Chlorophyll Fluorescence Photodegradation of Methylene Blue by TiO₂ Photodissociation of Chlorine Gas Silver Bromide Photodecomposition Cis-Trans Isomerization of Retinal Photosynthesis Ozone Formation by UV Light Silver Chloride Photodecomposition Dye-Sensitized Solar Cell (Grätzel Cell)

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.