Formation of Nitrogen Dioxide

2NO + O2 → 2NO2

Visão geral

Nitric oxide reacts with oxygen in the atmosphere to form nitrogen dioxide, a reddish-brown toxic gas. This reaction is central to atmospheric chemistry and smog formation. It occurs rapidly at room temperature without any catalyst needed.

Participantes

Papel Substância Coeficiente Estado
Produto Nitrogen Dioxide NO₂ 2 (g)

Exemplo do cotidiano

The brown haze visible over cities on smoggy days is largely due to nitrogen dioxide formed by this reaction from vehicle exhaust.

Importância industrial

Esta é uma etapa-chave no processo Ostwald para a produção de ácido nítrico. A gestão das emissões de NOₓ é fundamental para a qualidade do ar urbano. Os catalisadores nos automóveis convertem NOₓ em N₂ inofensivo.

Propriedades

Tipo
Synthesis
Reversível
Sim
Energia
Exotérmico
ΔH
-114,2 kJ/mol

Reações relacionadas

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Frequently Asked Questions

What is the equation for Formation of Nitrogen Dioxide?
The balanced equation is: 2NO + O₂ → 2NO₂.
What type of reaction is Formation of Nitrogen Dioxide?
Formation of Nitrogen Dioxide is a synthesis reaction. It is reversible under certain conditions.
Is Formation of Nitrogen Dioxide exothermic or endothermic?
Formation of Nitrogen Dioxide is exothermic (releases energy). The enthalpy change (ΔH) is -114.2 kJ/mol.