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Encyclopedia > Isobutane
General
Chemical Name n-Butane
Chemical formula CH3(CH2)2CH3
Molecular weight 58.1 g/mol
CAS number 106-97-8
MSDS Butane MSDS
SMILES  ?
Other names
  • ?
Physical properties
Density and phase at STP  ? g/cm3 (gas)
Solubility  ? in ?
Specific gravity  ?
Crystal structure  ?
pH (10% solution with water) 7.0
Acidity constant (pKa)  ?
Thermal decomposition  ? C (? K)
Phase behavior
Melting point -138.3 C (134.9 K)
Boiling point -0.5 C (272.7 K)
Triple point  ? K (? C)
 ? bar
Critical point  ? K (? C)
 ? bar
Heat of fusion
fusH)
 ? kJ/mol
Entropy of fusion
fusS)
 ? J/molK
Heat of vaporization
vapH)
21 kJ/mol
Safety
Ingestion  ?
Inhalation  ?
Skin  ?
Eyes  ?
Flash point -60 C
Autoignition temperature  ? C
Explosive limits  ? - ?%
OSHA Permissible Exposure Limit
(PEL)
 ? ppm
NIOSH Immediate Danger to Life and Health
(IDLH)
 ? ppm
Precautions
  • Hazards:
    • Extremely flammable
  • Personal protection:
    •  ?
  • Reacts with:
    •  ?
  • Storage:
    • Keep container in a well ventilated place
Liquid properties
ΔfH0liquid  ? kJ/mol
S0liquid  ? J/molK
Cp  ? J/molK
Density  ? g/cm3
Gas properties
ΔfH0gas -126 kJ/mol
S0gas 310 J/molK
Cp 97 J/molK

Except where noted, all data was produced under conditions of standard temperature and pressure.

Butane is an alkane hydrocarbon with the molecular formula C4H10. It has the following display formula:

 H H H H | | | | H - C - C - C - C - H | | | | H H H H 

It is a flammable, colorless, easily liquefied gas that is used extensively as a fuel for cigarette lighters and portable stoves.


Butane exists as two isomers:


n-butane is a fully hydrogenated linear chain of four carbon atoms: CH3CH2CH2CH3. Its boiling point is −0.6 C and its melting point is −138.3 C.


i-butane, or isobutane, has the formula CH3CH(CH3)2, and the systematic name 2-methylpropane. Its boiling point is −11.7 C and its melting point is −159.6 C.



Recent concerns with depletion of the ozone layer by freon gases have led to increased use of isobutane as a gas for refrigeration systems, especially in domestic refrigerators and freezers. When used as a refrigerant, isobutane is also known as R600a.


Butane gas

Alkanes are unreactive, as their C-C and C-H bonds are very strong. They do not react with acids, alkalis, metals, or oxidising agents. It may seem surprising, but petrol (octane) has no reaction with concentrated sulphuric acid, sodium metal or potassium manganate.


Butane gas is commonly used as bottled gas for cooking. Butane is commonly used as a camping gas called calor gas. It burns to form carbon dioxide and steam:


butane + oxygen -> carbon dioxide + steam


Burning camping gas forms carbon dioxide and steam (plentiful supply of air) and also carbon (soot) and carbon monoxide (in a limited supply of air).




Alkanes

methane
CH4

|

ethane
C2H6

|

propane
C3H8

|

butane
C4H10

|

pentane
C5H12

|

hexane
C6H14

heptane
C7H16

|

octane
C8H18

|

nonane
C9H20

|

decane
C10H22

|

undecane
C11H24

|

dodecane
C12H26

tridecane
C13H28

|

tetradecane
C14H30

|

pentadecane
C15H32

|

hexadecane
C16H34

|

heptadecane
C17H36

|

octadecane
C18H38

nonadecane
C19H40

|

eicosane
C20H42

|

heneicosane
C21H44

|

docosane
C22H46

|

tricosane
C23H48

|

tetracosane
C24H50

pentacosane
C25H52

|

hexacosane
C26H54

|

heptacosane
C27H56

|

octacosane
C28H58

|

nonacosane
C29H60

|

triacontane
C30H62

hentriacontane
C31H64

|

dotriacontane
C32H66

|

tritriacontane
C33H68

|

tetratriacontane
C34H70

|

pentatriacontane
C35H72

|

hexatriacontane
C36H74


  Results from FactBites:
 
Isobutane - definition of Isobutane in Encyclopedia (162 words)
It is a flammable, colorless, easily liquefied gas that is used extensively as a fuel for cigarette lighters and portable stoves.
Its boiling point is −11.7 °C and its melting point is −159.6 °C. Recent concerns with depletion of the ozone layer by freon gases have led to increased use of isobutane as a gas for refrigeration systems, especially in domestic refrigerators and freezers.
When used as a refrigerant, isobutane is also known as R600a.
  More results at FactBites »

 
 

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