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General |
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| Name | Ethene |
| Chemical formula | C H2 C H2 |
| Formula weight | 28.05 amu |
| Synonyms | Ethylene, Olefiant gas |
| CAS number | 74-85-1 |
| UN number | 1038 |
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Phase behavior |
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| Melting point | 104 K (-169.1 °C) |
| Boiling point | 169.4 K (-103.7°C) |
| Thermal decomposition | ? K (?°C) |
| Triple point | 104 K (-169°C)
0.0012 bar |
| Critical point | 282.5 K (9.5°C)
50.6 bar |
| ΔsubH | 44.5 kJ/mol |
| ΔfusHHeat of fusion is the heat absorbed by a unit mass of a solid chemical element at its melting point in order to convert the solid into a liquid at the same temperature. The heat of fusion is equal to the heat of solidification. The energy that goes into m | 3.35 kJ/mol |
| ΔfusSThe Entropy of fusion of a substance represents the increase in the degree of disorder involved in the transition from an organized crystalline solid to the disorganized structure of a liquid. It is denoted as ΔS and normally expressed in J / mol · | 32.2 J/mol·K |
| ΔvapHThe heat of vaporization is a physical property of substances. It is defined as the heat required to vaporize one mole of a substance at its boiling point under standard pressure (101325 Pa). The heat of vaporization is expressed in kJ/mol. The use of kJ/ | 13.5 kJ/mol |
| Solubility | Insoluble |
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Liquid properties |
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| ΔfH0liquidThe standard enthalpy of formation of a compound is the change of enthalpy that accompanies the formation of 1 mole of that substance from its component elements, at their standard states (the most stable form of the element or compound at 25 degrees Cels | ? kJThe joule (symbol J also called newton metre or coulomb volt is the SI unit of energy and work. The unit is pronounced to rhyme with "tool", and is named in honour of the physicist James Prescott Joule (1818-1889). 1 joule 1 N · 1 m 1 newton · 1 metre 1 k/ mol |
| S0liquid | 117.8 J/mol·K |
| Cp | 67.4 J/mol·K |
| Density | 0.577 ×103 kg/ m3 |
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Gas properties |
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| ΔfH0gas | 52.47 kJ/ mol |
| S0gas | 219.32 J/mol·K |
| Cp | 42.9 J/mol·K |
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Safety | |
| Acute effects | Breathing & cardiac troubles. CNS injury |
| Chronic effects | |
| Flash point | -136°C |
| Autoignition temperature | 450°C |
| Explosive limits | 2.7-36% |
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More info | |
| Properties | NIST WebBook |
| MSDS | Hazardous Chemical Database |
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SI units were used where possible. Unless otherwise stated, standard conditions were used. Disclaimer and references
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Ethylene or ethene is the simplest alkene hydrocarbon, consisting of two carbon atoms and four hydrogens. There is a double bond between the two carbons. Because it contains a double bond, ethylene is called an unsaturated hydrocarbon or an olefin.
The molecule cannot rotate around the double bond, and all six atoms lie in the same plane. The angle made by two carbon-hydrogen bonds in the molecule is 117°, very close to the 120° that would be predicted from ideal sp2 hybridization.
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