O-Xylene (data page)

This page provides supplementary chemical data on o-Xylene.

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. MSDS is available from MATHESON TRI-GAS, INC. in the SDSdata.org database.

Structure and properties

Structure and properties
Index of refraction, [1] nD	1.5058 at 20°C
Abbe number	?
Dielectric constant, [2] εr	2.568 ε0 at 20 °C
Bond strength	?
Bond length	?
Bond angle	?
Magnetic susceptibility	?
Surface tension [3]	30.10 dyn/cm at 20°C
Viscosity [4]	1.1049 mPa·s at 0°C 0.8102 mPa·s at 20°C 0.6270 mPa·s at 40°C 0.4168 mPa·s at 80°C 0.2626 mPa·s at 140°C
Solubility [5]	0.171 g/L at 25°C 0.21 g/L at 45°C

Thermodynamic properties

Phase behavior
Triple point	247.8 K (−25.3 °C), ? Pa
Critical point	631 K (358 °C), 3700 kPa
Std enthalpy change of fusion, ΔfusHo	13.6 kJ/mol
Std entropy change of fusion, ΔfusSo	54.87 J/(mol·K) at −25.3
Std enthalpy change of vaporization, ΔvapHo	36.24 kJ/mol at 144.5°C
Std entropy change of vaporization, ΔvapSo	? 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)
Liquid properties
Std enthalpy change of formation, ΔfHoliquid	−24.4 kJ/mol
Standard molar entropy, Soliquid	247 J/(mol K)
Enthalpy of combustion, ΔcHo	−4552 kJ/mol
Heat capacity, cp	187.0 J/(mol K) at 25°C
Gas properties
Std enthalpy change of formation, ΔfHogas	19.0 kJ/mol
Standard molar entropy, Sogas	353.6 J/(mol K)
Heat capacity, cp	132.5 J/(mol K) at 25°C
van der Waals' constants [6]	a = 3038 L2 kPa/mol2 b = 0.1755 liter per mole

Vapor pressure of liquid

P in mm Hg		1	10	40	100	400	760
T in °C		−3.8	32.1	59.5	81.3	121.7	144.4

Table data obtained from CRC Handbook of Chemistry and Physics 44th ed.

log₁₀ of o-Xylene vapor pressure. Uses formula: ${\displaystyle \scriptstyle \log _{e}P_{mmHg}=}$${\displaystyle \scriptstyle \log _{e}({\frac {760}{101.325}})-10.06059\log _{e}(T+273.15)-{\frac {7946.229}{T+273.15}}+83.32184+5.939742\times 10^{-6}(T+273.15)^{2}}$ obtained from CHERIC

Distillation data

See also:

• m-xylene (data page)
• p-xylene (data page)

Vapor-liquid Equilibrium for o-Xylene/m-Xylene [8] P = 26.66 kPa BP Temp. °C  % by mole m-xylene liquid vapor 100.1 0.0 0.0 99.8 4.7 5.6 99.6 9.7 11.4 99.2 17.8 20.6 98.8 25.9 29.3 98.4 34.1 38.1 97.9 42.5 46.8 97.6 49.6 53.9 97.2 57.4 61.5 96.8 65.5 69.2 96.5 73.5 76.5 96.1 80.8 83.2 95.8 88.6 90.2 95.6 93.7 94.6 95.3 100.0 100.0

Vapor-liquid Equilibrium for o-Xylene/Carbon tetrachloride [8] P = 760 mm Hg BP Temp. °C  % by mole carbon tetrachloride liquid vapor 142.0 1.8 6.5 136.0 6.4 22.9 130.4 11.2 36.9 125.0 16.1 49.4 120.7 20.4 57.3 116.1 25.3 64.6 111.8 30.2 70.9 107.9 35.2 75.9 104.2 40.4 80.3 104.1 40.5 80.5 99.4 47.8 85.2 95.1 55.4 88.9 91.6 62.4 91.6 88.2 70.0 94.0 85.3 77.1 95.8 82.6 84.1 97.2 80.0 91.0 98.5 77.7 97.6 99.6

Vapor-liquid Equilibrium for o-Xylene/Ethanol [8] P = 101.3 kPa BP Temp. °C  % by mole ethanol liquid vapor 78.3 99.52 99.66 78.7 98.59 99.03 78.7 97.73 98.52 79.0 95.78 97.40 79.3 90.59 95.09 79.7 86.79 94.16 80.0 85.01 93.70 80.2 80.91 92.91 80.3 76.77 92.36 82.0 67.69 91.21 83.8 48.66 89.25 88.1 25.11 87.32 97.3 10.94 81.49 112.8 5.22 65.91 137.3 0.65 22.90

Vapor-liquid Equilibrium for o-Xylene/Methanol [8] P = 101.3 kPa BP Temp. °C  % by mole Methanol liquid vapor 64.7 98.78 99.10 64.8 98.33 98.81 64.8 97.67 98.45 64.9 96.70 97.96 65.3 93.34 96.82 65.7 86.84 95.68 66.3 84.24 95.31 66.7 83.30 95.65 67.3 76.74 94.97 68.4 49.33 94.52 71.5 21.76 93.84 102.1 2.49 80.00

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

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

References

1. Merck Index of Chemicals and Drugs, 9th ed. monograph 9743
2. CRC Handbook of Chemistry and Physics, 44th ed. pp 2611–2620
3. CRC Handbook of Chemistry and Physics, 44th ed. pp 2244–2248
4. Lange's Handbook of Chemistry, 10th ed. pp 1669–1674
5. CRC Handbook of Chemistry and Physics, 85th ed. p8-111
6. Lange's Handbook of Chemistry, 10th ed, pp 1522–1524
7. "Pure Component Properties" (Queriable Database). Chemical Engineering Research Information Center. Retrieved 27 May 2007.
8. "Binary Vapor-Liquid Equilibrium Data" (Queriable database). Chemical Engineering Research Information Center. Retrieved 27 May 2007.

• Linstrom, Peter (1997). "NIST Standard Reference Database". National Institute of Standards and Technology. doi:10.18434/T4D303.