# 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, n$_D$ | 1.5058 at 20°C |
| Abbe number | ? |
| Dielectric constant, ε$_r$ | 2.568 ε$_0$ at 20 °C |
| Bond strength | ? |
| Bond length | ? |
| Bond angle | ? |
| Magnetic susceptibility | ? |
| Surface tension | 30.10 dyn/cm at 20°C |
| Viscosity | 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 | 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, Δ$_{fus}$H$^o$ | 13.6 kJ/mol |
| Std entropy change of fusion, Δ$_{fus}$S$^o$ | 54.87 J/(mol·K) at −25.3 |
| Std enthalpy change of vaporization, Δ$_{vap}$H$^o$ | 36.24 kJ/mol at 144.5°C |
| Std entropy change of vaporization, Δ$_{vap}$S$^o$ | ? J/(mol·K) |
| Solid properties ||
| Std enthalpy change of formation, Δ$_f$H$^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$_f$H$^o$$_{liquid}$ | −24.4 kJ/mol |
| Standard molar entropy, S$^o$$_{liquid}$ | 247 J/(mol K) |
| Enthalpy of combustion, Δ$_c$H$^o$ | −4552 kJ/mol |
| Heat capacity, c$_p$ | 187.0 J/(mol K) at 25°C |
| Gas properties ||
| Std enthalpy change of formation, Δ$_f$H$^o$$_{gas}$ | 19.0 kJ/mol |
| Standard molar entropy, S$^o$$_{gas}$ | 353.6 J/(mol K) |
| Heat capacity, c$_p$ | 132.5 J/(mol K) at 25°C |
| van der Waals' constants | a = 3038 L$^2$ kPa/mol$^2$ b = 0.1755 liter per mole |

## Vapor pressure of liquid

| P in mm Hg | P in mm Hg | 1 | 10 | 40 | 100 | 400 | 760 |
| T in °C | 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.

## Distillation data

See also:
* m-xylene (data page)
* p-xylene (data page)
Vapor-liquid Equilibrium for o-Xylene/m-Xylene P = 26.66 kPa :
| BP Temp. °C | % by mole m-xylene | % by mole m-xylene |
| BP Temp. °C | 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 P = 760 mm Hg :
| BP Temp. °C | % by mole carbon tetrachloride | % by mole carbon tetrachloride |
| BP Temp. °C | 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 P = 101.3 kPa :
| BP Temp. °C | % by mole ethanol | % by mole ethanol |
| BP Temp. °C | 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 P = 101.3 kPa :
| BP Temp. °C | % by mole Methanol | % by mole Methanol |
| BP Temp. °C | 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 :
| 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 | |
* view
* Except where noted otherwise, data relate to Standard temperature and pressure.
* Reliability of data general note.