Cyclohexane (data page)

This page provides supplementary chemical data on cyclohexane.

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 and follow its directions.

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Structure and properties

Structure and properties
Index of refraction, nD	1.4262 at 20°C
Abbe number	?
Dielectric constant, εr	2.023 ε0 at 20 °C
Bond strength	?
Bond length[1]	230 pm H–C
Bond angle	109.5° H–C–H 109.5°C–C–C 109.5° H–C–C
Magnetic susceptibility	?
Surface tension	27 dyn/cm    at 10°C 25.3 dyn/cm at 20°C 15.7 dyn/cm at 80°C
Viscosity[2]	1.03 mPa·s at 17°C 0.93 mPa·s at 22°C 0.86 mPa·s at 27°C 0.75 mPa·s at 35°C

Thermodynamic properties

Phase behavior
Triple point	279.7 K (6.55 °C), ? Pa
Critical point	554 K (281 °C), 4070 kPa
Std enthalpy change of fusion, ΔfusHo	2.68 kJ/mol crystal I → liquid
Std entropy change of fusion, ΔfusSo	9.57 J/(mol·K) crystal I → liquid
Std enthalpy change of vaporization, ΔvapHo	32 kJ/mol
Std entropy change of vaporization, ΔvapSo	111.80 J/(mol·K)
Solid properties
Std enthalpy change of formation, ΔfHosolid	? kJ/mol
Standard molar entropy, Sosolid	? J/(mol K)
Heat capacity, cp	? J/(mol K)
Enthalpy of transition, ΔtrsHo	6.7 kJ/mol at –87.0°C crystal II → crystal I
Entropy of transition, ΔtrsSo	36 J/(mol·K) at –87.0°C crystal II → crystal I
Liquid properties
Std enthalpy change of formation, ΔfHoliquid	–156.4 kJ/mol
Standard molar entropy, Soliquid	204 J/(mol K)
Enthalpy of combustion, ΔcHo	–3930 kJ/mol
Heat capacity, cp	156 J/(mol K)
Gas properties
Std enthalpy change of formation, ΔfHogas	–123.1 kJ/mol
Standard molar entropy, Sogas	298.19 J/(mol K)
Heat capacity, cp	105.3 J/(mol K)
van der Waals' constants[3]	a = 2311 L2 kPa/mol2 b = 0.1424 liter per mole

Vapor pressure of liquid

P in mm Hg		1	10	40	100	400	760	1520	3800	7600	15200	30400	45600
T in °C		–45.3(s)	–15.9(s)	6.7	25.5	60.8	80.7	106.0	146.4	184.0	228.4	—	—

Table data obtained from CRC Handbook of Chemistry and Physics 44th ed. The "(s)" annotation indicates equilibrium temperature of vapor over solid. Otherwise value is equilibrium temperature of vapor over liquid.

log₁₀ of Cyclohexane vapor pressure. Uses formula: $\scriptstyle \log_e P_{mmHg} =$$\scriptstyle \log_e (\frac {760} {101.325}) - 9.200978\log_e(T+273.15) - \frac {6354.898} {T+273.15} + 75.65058 + 7.374814 \times 10^{-06} (T+273.15)^2$ obtained from CHERIC^[4]

Distillation data

Vapor-liquid Equilibrium for Cyclohexane/Ethanol[5] P = 760 mm Hg BP Temp. °C  % by mole ethanol liquid vapor 73.99 2.0 17.5 69.08 3.0 30.2 66.94 6.5 35.8 66.08 8.1 36.3 66.37 8.6 36.5 65.59 12.5 FAKE 65.23 15.1 39.6 65.12 20.6 40.8 64.93 25.8 41.5 64.87 28.3 41.8 64.84 31.5 42.6 64.78 36.6 43.0 64.77 40.3 43.1 64.77 43.1 43.1 64.78 44.4 43.8 64.81 50.0 44.3 64.88 55.7 45.5 65.01 61.3 46.0 64.99 62.1 45.8 65.25 67.8 47.5 65.56 73.8 50.5 66.03 76.3 49.6 65.93 77.6 51.5 66.40 78.1 49.8 66.90 80.9 54.5 67.26 83.3 57.8 67.98 85.3 59.5 68.86 88.1 62.3 69.44 89.8 65.3 70.11 90.9 67.8 71.42 92.9 72.5 72.48 95.1 77.8     Vapor-liquid Equilibrium for Cyclohexane/Benzene[5] P = 760 mm Hg BP Temp. °C  % by mole benzene liquid vapor 79.5 10.1 13.1 78.9 17.1 21.1 78.4 25.6 29.3 77.8 34.3 37.6 77.5 42.8 44.5 77.4 52.5 52.9 77.4 57.1 56.4 77.6 66.5 64.5 77.9 75.9 72.8 78.2 81.0 77.7 78.6 86.3 83.4 79.3 94.5 92.6   Vapor-liquid Equilibrium for Cyclohexane/n-Hexane[5] P = 101.0 kPa BP Temp. °C  % by mole n-hexane liquid vapor 80.60 0.00 0.00 78.87 7.9 12.12 78.15 12.50 18.30 77.36 18.06 25.19 76.85 21.65 29.30 76.29 25.92 34.13 75.85 29.39 37.92 75.29 33.52 42.38 75.29 37.86 46.93 74.23 41.63 50.71 73.58 46.72 55.63 73.11 50.66 59.21 72.26 59.26 67.28 71.11 69.43 76.07 70.45 76.18 81.40 69.05 90.70 93.13 68.64 100.00 100.00     Vapor-liquid Equilibrium for Cyclohexane/Acetic acid[5] P = 101.325 kPa BP Temp. °C  % by mole acetic acid liquid vapor 79.60 2.75 6.31 79.32 5.20 9.85 78.84 101.2 15.01 78.53 14.06 18.04 78.50 21.39 21.98 78.81 35.30 26.20 79.13 49.30 29.00 79.33 56.10 30.00 81.44 74.60 33.50 81.66 75.80 34.20 85.18 86.70 40.00 90.52 92.50 49.20 91.90 93.20 51.70 95.52 94.57 57.82 98.94 95.96 63.33 105.75 97.84 75.69 113.16 99.33 90.67     Vapor-liquid Equilibrium for Cyclohexane/Isopropanol[5] P = 760 mm Hg BP Temp. °C  % by mole cyclohexane liquid vapor 78.71 2.7 11.2 76.91 7.0 21.8 74.96 11.6 28.3 74.80 12.0 27.6 72.28 19.1 37.1 70.19 30.6 48.9 69.35 47.3 55.5 69.20 51.6 57.0 69.14 51.6 57.2 69.11 51.8 56.8 68.80 52.8 58.3 69.01 53.8 58.2 69.08 57.1 58.2 69.10 70.8 62.7 69.42 74.2 64.9 69.45 78.4 66.0 69.66 80.7 67.3 70.11 86.2 69.7 70.31 87.3 70.9 71.50 92.1 77.3 74.74 97.8 85.0 76.73 99.5 89.3 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 ^ Morrison, Robert Thornton; Boyd, Robert Neilson: Organic Chemistry 2nd ed. p 288 ^ Lange's Handbook of Chemistry, 10th ed. pp 1669-1674 ^ Lange's Handbook of Chemistry 10th ed, pp 1522-1524 ^ "Pure Component Properties" (Queriable database). Chemical Engineering Research Information Center. http://www.cheric.org/research/kdb/hcprop/cmpsrch.php. Retrieved 19-May 2007.  ^ a b c d e "Binary Vapor-Liquid Equilibrium Data" (Queriable database). Chemical Engineering Research Information Center. http://www.cheric.org/research/kdb/hcvle/hcvle.php. Retrieved 19 May 2007.  "NIST Standard Reference Database". http://webbook.nist.gov/chemistry/.  Except where noted otherwise, data relate to standard ambient temperature and pressure. Disclaimer applies.