Isobutane (data page)

From Wikipedia, the free encyclopedia
Jump to navigation Jump to search

This page provides supplementary chemical data on isobutane.

Material Safety Data Sheet[edit]

The handling of this chemical may incur notable safety precautions. It is highly recommend that you seek the Material Safety Datasheet (MSDS) for this chemical from a reliable source such as SIRI, and follow its directions.

Structure and properties[edit]

Structure and properties
Index of refraction, nD ?
Abbe number ?
Dielectric constant, εr ? ε0 at ? °C
Bond strength ?
Bond length ?
Bond angle ?
Magnetic susceptibility ?
Surface tension 10.3 dyn/cm at 20°C
    P 300 kPa

Thermodynamic properties[edit]

Phase behavior
Triple point 113.55K (–159.6 °C), 0.019481 Pa
Critical point 407.7 K (134.6 °C), 3650 kPa
Std enthalpy change
of fusion
, ΔfusHo
4.54 kJ/mol
Std entropy change
of fusion
, ΔfusSo
39.92 J/(mol·K)
Std enthalpy change
of vaporization
, ΔvapHo
21.3 kJ/mol
Std entropy change
of vaporization
, ΔvapSo
81.46 J/(mol·K)
Solid properties
Std enthalpy change
of formation
, ΔfHosolid
? kJ/mol
Standard molar entropy,
? J/(mol K)
Heat capacity, cp ? J/(mol K)
Liquid properties
Std enthalpy change
of formation
, ΔfHoliquid
? kJ/mol
Standard molar entropy,
200.79 J/(mol K)
Heat capacity, cp 129.70 J/(mol K) –253°C to –13°C
Gas properties
Std enthalpy change
of formation
, ΔfHogas
–134.2 kJ/mol
Standard molar entropy,
249.7 J/(mol K)
Enthalpy of combustion, ΔcHo –2869 kJ/mol
Heat capacity, cp 95.21 J/(mol K) at 20°C
van der Waals' constants[1] a = 1304.1 L2 kPa/mol2
b = 0.1142 liter per mole

Vapor pressure of liquid[edit]

P in mm Hg 1 10 40 100 400 760 1520 3800 7600 15200 30400 45600
T in °C –109.2 –86.4 –68.4 –54.1 –27.1 –11.7 7.5 39.0 68.8 99.5  —  —

Table data obtained from CRC Handbook of Chemistry and Physics 44th ed.

Vapor pressure of iso-butane. From formula: obtained from Lange's Handbook of Chemistry, 10th ed.

Spectral data[edit]

λmax ? nm
Extinction coefficient, ε ?
Major absorption bands ? cm−1
Proton NMR  
Carbon-13 NMR  
Other NMR data  
Masses of
main fragments


  1. ^ Lange's Handbook of Chemistry 10th ed, pp 1522-1524

Except where noted otherwise, data relate to standard ambient temperature and pressure.

Disclaimer applies.