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Properties
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General
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| Name |
Nitrogen dioxide |
| Chemical formula |
N O2 |
| Appearance |
brown/orange gas |
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Physical
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| Formula weight |
46.01 amu |
| Melting point |
-263.85 K (9.3 °C) |
| Boiling point |
-252.00 K (21.15 °C) |
| Density |
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| Crystal structure |
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| Solubility |
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Thermochemistry
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| ΔfH0gas |
kJ/ molThe mole (symbol: mol) is one of the seven SI base units and is commonly used in chemistry. It measures the amount of substance of a system and is defined as the amount of substance that contains as many elementary entities as there are atoms in exactly 0 |
| ΔfH0liquid |
kJ/mol |
| ΔfH0solid |
kJ/mol |
| S0gas, 1 barIn chemistry, the standard molar entropy is the entropy content of one mole of substance, under conditions of standard temperature and pressure. By comparing the entropies of products and reactants in a chemical reaction, we can determine whether the reac |
J/mol·K |
| S0liquid, 1 bar |
J/mol·K |
| S0solid |
J/mol·K |
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Safety
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| Ingestion |
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| Inhalation |
Deadly poison! Insidious. Can cause lung edemaEdema ( BE: oedema formerly known as dropsy is swelling of any organ or tissue due to accumulation of excess fluid. Edema has many root causes, but its common mechanism is accumulation of fluid into the tissues. Types of edema are pitting edema and non-pi or death after several days delay. 100 ppm dangerous, 200 ppm may be lethal for short exposures. |
| Skin |
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| Eyes |
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| More info |
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SIThe International System of Units (symbol: SI (for the French phrase Systeme International d'Unites , is the most widely used system of units. It is used for everyday commerce in virtually every country of the world except the United States, and it is uni units were used where possible. Unless otherwise stated, standard conditions were used.
Disclaimer and references
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The chemical compoundA chemical compound is a substance formed from two or more elements, with a fixed ratio determining the composition. For example, dihydrogen monoxide ( water, ) is a compound composed of two hydrogen atoms for every oxygen atom. In general, this fixed rat 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
Oxides
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