Nitrogen dioxide Details, Meaning Nitrogen dioxide Article and Explanation Guide

Nitrogen dioxide Guide, Meaning , Facts, Information and Description

**Properties**
General
Name	Nitrogen dioxide
Chemical formula	N O₂
Appearance	brown/orange gas
Physical
Formula weight	46.01 amu
Melting point	-263.85 K (9.3 °C)
Boiling point	-252.00 K (21.15 °C)
Density
Crystal structure
Solubility
Thermochemistry
Δ_fH⁰_gas;	kJ/mol
Δ_fH⁰_liquid	kJ/mol
Δ_fH⁰_solid	kJ/mol
S⁰_{gas, 1 bar}	J/mol·K
S⁰_{liquid, 1 bar}	J/mol·K
S⁰_solid	J/mol·K
Safety
Ingestion
Inhalation	Deadly poison! Insidious. Can cause lung edema or death after several days delay. 100 ppm dangerous, 200 ppm may be lethal for short exposures.
Skin
Eyes
More info
SI units were used where possible. Unless otherwise stated, standard conditions were used. Disclaimer and references

The chemical compound nitrogen dioxide is an orange/brown gas with a characteristic sharp, biting odor. It is considered an insidious deadly poison by inhalation.

Nitric oxide (NO) spontaneously produces the dioxide when exposed to air:

2 NO + O₂ → 2NO₂

It is also generated by various nitric acid reactions, e.g. when metals, such as copper or silver, are exposed to nitric acid.

It reacts readily with water, even at normal temperature and pressure, where it disproportionates to nitric and nitrous acid. That reaction is used in the Ostwald process.

Vapor pressure, mmHg: 400 at 80°C
Vapor density (air=1): 1.58
Specific gravity/density: 1.4494 at 20°C
Solubility in water: Reacts
Odor threshold: 2.0 mg/m³
Heat of vaporization: 9.110 kcal/mole

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Nitrogen dioxide Guide, Meaning , Facts, Information and Description

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