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 MSDS Search Engine, and follow its directions.

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: \scriptstyle \log_e P_{mmHg} =\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 ? cm−1
NMR
Proton NMR  
Carbon-13 NMR  
Other NMR data  
MS
Masses of
main fragments		  

References

  1. ↑ Lange's Handbook of Chemistry, 10th ed. pp. 1234–1237
  2. ↑ Lange's Handbook of Chemistry, 10th ed. pp. 1289–1376
  3. ↑ A.P. Fröba, L. Penedo Pellegrino, and A. Leipertz (June 2003). "Viscosity and Surface Tension of Saturated n-Pentane" (PDF). National Institute of Standards and Technology (15th Symposium on Thermophysical Properties). Retrieved 30 May 2007.
  4. ↑ Lange's Handbook of Chemistry, 10th ed. pp. 1669–1674
  5. ↑ "Pure Component Properties" (Queriable database). Chemical Engineering Research Information Center. Retrieved 30 May 2007.

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

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