Butane_(data_page) Knowpia

This page provides supplementary chemical data on n-butane.

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 eChemPortal, and follow its directions.

Structure and properties edit

Structure and properties
Index of refraction, n_D	1.3326 at 20 °C^[1]
Dielectric constant, ε_r	1.7697 ε₀ at 23 °C^[2]
Symmetry group	C_2h
Magnetic susceptibility	?
Surface tension	12.46 dyn/cm at 20 °C P ≈ 225 kPa

Thermodynamic properties edit

Phase behavior
Density (liquid) 0 °C	600 kg/m³
Density (saturated vapor) 1 atm, -0.5 °C	2.6 kg/m³
Triple point	134.6 K (–138.5 °C), 0.7 Pa
Critical point	425.1 K (152.0 °C), 3796.0 kPa
Std enthalpy change of fusion, Δ_fusH^o	4.66 kJ/mol
Std entropy change of fusion, Δ_fusS^o	34.56 J/(mol·K)
Std enthalpy change of vaporization, Δ_vapH^o	22.44 kJ/mol
Std entropy change of vaporization, Δ_vapS^o	82.30 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	-147.6 kJ/mol
Standard molar entropy, S^o_liquid	229.7 J/(mol K)
Heat capacity, c_p	132.42 J/(mol K) –262 °C to –3 °C
Gas properties
Std enthalpy change of formation, Δ_fH^o_gas	–124.7 kJ/mol
Standard molar entropy, S^o_gas	310.23 J/(mol K)
Enthalpy of combustion, Δ_cH^o	–2877.5 kJ/mol
Heat capacity, c_p	98.49 J/(mol K) at 25 °C
n-butane van der Waals' constants^[3]	a = 1466.2 L² kPa/mol² b = 0.1226 liter per mole

The data about butane density over a range of temperature [−50; +50] °C^[4]

Vapor pressure of liquid edit

P in mm Hg		1	10	40	100	400	760	1520	3800	7600	15200	30400	45600
T in °C		–101.5	–77.8	–59.1	–44.2	–16.3	–0.5	18.8	50.0	79.5	116.0	—	—

n-Butane: Table data obtained from CRC Handbook of Chemistry and Physics 44th ed.

Vapor pressure of n-butane. From formula:

\scriptstyle \log _{10}P_{mmHg}=6.83029-{\frac {945.90}{240.0+T}}

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

Spectral data edit

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

References edit

^ CRC Handbook of Chemistry and Physics 85th ed, pp 202
^ CRC Handbook of Chemistry and Physics 85th ed, pp 1148
^ Lange's Handbook of Chemistry 10th ed, pp. 1522–1524
^ Zivenko, Oleksiy (2019). "LPG Accounting Specificity During ITS Storage and Transportation". Measuring Equipment and Metrology. 80 (3): 21–27. doi:10.23939/istcmtm2019.03.021. ISSN 0368-6418. S2CID 211776025.