Formation of Nitrogen Dioxide
2NO + O2 → 2NO2
Overview
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.
Participants
| Role | Substance | Coefficient | State |
|---|---|---|---|
| Product | Nitrogen Dioxide NO₂ | 2 | (g) |
Everyday Example
The brown haze visible over cities on smoggy days is largely due to nitrogen dioxide formed by this reaction from vehicle exhaust.
Industrial Importance
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.
Properties
- Type
- Synthesis
- Reversible
- Yes
- Energy
- Exothermic
- ΔH
- -114.2 kJ/mol
Related Reactions
Fischer-Tropsch Synthesis (General)
Formation of Aluminum Oxide
Formation of Ammonia (Haber Process)
Formation of Barium Oxide
Formation of Barium Sulfate
Formation of Beryllium Oxide
Formation of Cadmium Oxide
Formation of Calcium Carbonate from Oxides
Formation of Calcium Hydroxide
Formation of Calcium Oxide (Quicklime)
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.