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Topic summary

Isobutane

Isobutane
Names Preferred IUPAC name
2-Methylpropane
Other names
  • Isobutane
  • R600a
Identifiers
3D model (JSmol)
Abbreviations Me3CH 1730720 ChEBI
ChemSpider
ECHA InfoCard100.000.780EC Number
  • 200-857-2
E numberE943b (glazing agents, ...)1301 KEGG
RTECS number
  • TZ4300000
UNII
UN number1969
  • InChI=1S/C4H10/c1-4(2)3/h4H,1-3H3
    Key: NNPPMTNAJDCUHE-UHFFFAOYSA-N
  • CC(C)C
Properties C4H10Molar mass58.124 g·mol Appearance Colorless gas OdorOdorless Density
  • 2.51kg/m (at 15 °C, 100kPa)
  • 563 kg/m (at 15 °C, boiling liquid)
Melting point−159.42 °C (−254.96 °F; 113.73 K) Boiling point−11.78 °C (10.80 °F; 261.37 K) 48.9mg⋅L (at 25 °C (77 °F)) Vapor pressure3.1 atm (310 kPa) (at 21 °C (294 K; 70 °F)) 8.6nmol⋅Pa⋅kg Conjugate acid−51.7·10 cm/mol Thermochemistry 96.65J⋅K⋅mol −134.8–−133.6kJ⋅mol −2.86959–−2.86841MJ⋅mol Hazards GHS labelling: DangerH220P210NFPA 704 (fire diamond)
1
4
0
Flash point−83 °C (−117 °F; 190 K) 460 °C (860 °F; 733 K) Explosive limits1.4–8.3% NIOSH (US health exposure limits):
PEL (Permissible)
None
REL (Recommended)
TWA 800ppm (1900 mg/m)
IDLH (Immediate danger)
N.D. Safety data sheet (SDS) lindeus.comRelated compounds
Related alkane
IsopentaneSupplementary data page Isobutane (data page)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Isobutane, also known as i-butane, 2-methylpropane or methylpropane, is a chemical compound with molecular formula HC(CH3)3. An isomer of butane, it is a colorless, odorless gas. Isobutane is the simplest alkane with a tertiary carbon atom, and is used as a precursor molecule in the petrochemical industry, such as in the synthesis of isooctane.

Wikipedia source