Isobutane_(data_page)

Isobutane (data page)

Chemical data page

This page provides supplementary chemical data on isobutane.

Vapor pressure of liquid

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:

\scriptstyle \log _{10}P_{mmHg}=6.74808-{\frac {882.80}{240.0+T}}

obtained from Lange's Handbook of Chemistry, 10th ed.

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[lange1522-1] [1]
Lange's Handbook of Chemistry 10th ed, pp 1522-1524

[1]

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

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, Δ_fusH^o	4.54 kJ/mol
Std entropy change of fusion, Δ_fusS^o	39.92 J/(mol·K)
Std enthalpy change of vaporization, Δ_vapH^o	21.3 kJ/mol
Std entropy change of vaporization, Δ_vapS^o	81.46 J/(mol·K)
Solid properties
Std enthalpy change of formation, Δ_fH^o_solid	? kJ/mol
Standard molar entropy, S^o_solid	? J/(mol K)
Heat capacity, c_p	? J/(mol K)
Liquid properties
Std enthalpy change of formation, Δ_fH^o_liquid	? kJ/mol
Standard molar entropy, S^o_liquid	200.79 J/(mol K)
Heat capacity, c_p	129.70 J/(mol K) –253°C to –13°C
Gas properties
Std enthalpy change of formation, Δ_fH^o_gas	–134.2 kJ/mol
Standard molar entropy, S^o_gas	249.7 J/(mol K)
Enthalpy of combustion, Δ_cH^o	–2869 kJ/mol
Heat capacity, c_p	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

UV-Vis
λ_max	? nm
Extinction coefficient, ε	?
IR
Major absorption bands	? cm⁻¹
NMR
Proton NMR
Carbon-13 NMR
Other NMR data
MS
Masses of main fragments

Isobutane_(data_page)

Isobutane (data page)

Material Safety Data Sheet

Structure and properties

Thermodynamic properties

Vapor pressure of liquid

Spectral data

References

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