Pentane (data page)

This page provides supplementary chemical data on n-pentane.

Material Safety Data Sheet

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.

• Mallinckrodt Baker.

Structure and properties

Structure and properties
Index of refraction,[1] nD	1.3575 at 20 °C
Abbe number	?
Dielectric constant,[2] εr	1.844 ε0 at 20 °C
Bond strength	?
Bond length	?
Bond angle	?
Magnetic susceptibility	?
Surface tension[3]	18.16 dyn/cm at 0 °C 17.03 dyn/cm at 10 °C 15.82 dyn/cm at 20 °C 14.73 dyn/cm at 30 °C 13.66 dyn/cm at 40 °C
Viscosity[4]	0.2894 mPa·s at 0 °C 0.2395 mPa·s at 20 °C 0.2200 mPa·s at 30 °C

Thermodynamic properties

Phase behavior
Triple point	143.46 K (–128.69 °C), 0.076 Pa
Critical point	469.8 K (196.7 °C), 3360 kPa
Std enthalpy change of fusion, ΔfusHo	8.4 kJ/mol
Std entropy change of fusion, ΔfusSo	58.5 J/(mol·K)
Std enthalpy change of vaporization, ΔvapHo	26.200 kJ/mol at 25 °C 25.79 kJ/mol at 36.1 °C
Std entropy change of vaporization, ΔvapSo	87.88 J/(mol·K) at 25 °C
Solid properties
Std enthalpy change of formation, ΔfHosolid	? kJ/mol
Standard molar entropy, Sosolid	? J/(mol K)
Heat capacity, cp	? J/(mol K)
Liquid properties
Std enthalpy change of formation, ΔfHoliquid	–173.5 kJ/mol
Standard molar entropy, Soliquid	263.47 J/(mol K)
Enthalpy of combustion, ΔcHoliquid	–3509 kJ/mol
Heat capacity, cp	167.19 J/(mol K) at 25 °C
Gas properties
Std enthalpy change of formation, ΔfHogas	–146.8 kJ/mol
Standard molar entropy, Sogas	347.82 J/(mol K)
Enthalpy of combustion, ΔcHogas	–3535 kJ/mol
Heat capacity, cp	120.07 J/(mol K) at 25 °C

Vapor pressure of liquid

P in mm Hg		1	10	40	100	400	760	1520	3800	7600	15200	30400	45600
T in °C		–76.6	–50.1	–29.2	–12.6	18.5	36.1	58.0	92.4	124.7	164.3	—	—

Table data obtained from CRC Handbook of Chemistry and Physics 47th ed.

log₁₀ of n-Pentane vapor pressure. Uses formula: ${\displaystyle \scriptstyle \log _{e}P_{mmHg}=}$${\displaystyle \scriptstyle \log _{e}({\frac {760}{101.325}})-10.41840\log _{e}(T+273.15)-{\frac {5778.024}{T+273.15}}+81.92460+1.178208\times 10^{-5}(T+273.15)^{2}}$ obtained from CHERIC^[5]

Spectral data

UV-Vis
λmax	? nm
Extinction coefficient, ε	?
IR
Major absorption bands	2881, 2940, 2965 cm−1 [6]
NMR
Proton NMR
Carbon-13 NMR
Other NMR data
MS
Masses of main fragments

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• Except where noted otherwise, data relate to Standard temperature and pressure.
• Reliability of data general note.