senyawa kimia From Wikipedia, the free encyclopedia
Etena) adalah sebatian kimia hidrokarbon alkena yang paling ringkas terdiri daripada empat atom hidrogen dan dua atom karbon yang terikat oleh satu ikatan ganda dua. Disebabkan oleh pengikatan dubel, etana dikatakan sebagai satu hidrokarbon tak tepu atau satu olefin.
Etena | ||||
---|---|---|---|---|
Umum | ||||
Nama sistematik | Etena | |||
Formula molekul | C2H4 | |||
SMILES | C=C | |||
Jisim molar | 28.05 g/mol | |||
Rupabentuk | Gas tidak berwarna | |||
nombor CAS | [74-85-1] | |||
Ciri-ciri | ||||
Ketumpatan dan fasa | 1.178 g/l pada 15C, gas | |||
Kelarutan dalam air | Tidak larut | |||
Takat beku | −169.1 °C | |||
Takat didih | −103.7 °C | |||
Struktur | ||||
Bentuk molekul | planar | |||
Dipole moment | sifar | |||
Kumpulsn Simetri | D2h | |||
Data Termodinamik | ||||
Entalpi piawai bagi formasi ΔfH°gas |
+52.47 kJ/mol | |||
Entropi molar piawai S°gas |
219.32 J·K−1·mol−1 | |||
Bahaya | ||||
MSDS | MSDS Luaran | |||
EU classification | Very flammable (F+) | |||
NFPA 704 |
| |||
R-phrases | R12, R67 | |||
S-phrases | S2, S9, S16, S33, S46 | |||
Flash point | Flammable gas | |||
Explosive limits | 2.7–36.0% | |||
Autoignition temperature | 490 °C | |||
Supplementary data page | ||||
Structure and properties |
n, εr, etc. | |||
Thermodynamic data |
Phase behaviour Solid, liquid, gas | |||
Spectral data | UV, IR, NMR, MS | |||
Related compounds | ||||
Other alkenes | propena butena | |||
Related compounds | etana asetilena | |||
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) Infobox disclaimer and references | ||||
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