Formation of Nitrogen Dioxide

2NO + O₂ → 2NO₂

Tổng quan

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.

Người tham gia

Vai trò	Chất	Hệ số	Trạng thái
Sản phẩm	Nitrogen Dioxide NO₂	2	(g)

Ví dụ thực tế

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

Tầm quan trọng công nghiệp

This is a key step in the Ostwald process for nitric acid production. Managing NOx emissions is a major environmental and regulatory concern for power plants and vehicles.

Tính chất

Loại: Synthesis
Thuận nghịch: Có
Năng lượng: Tỏa nhiệt
ΔH: -114,2 kJ/mol

Phản ứng liên quan

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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.