title: M-Xylene (data page)
text: # M-Xylene (data page)
  
  This page provides supplementary chemical data on m-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 SIRI, and follow its directions.
  
  ## Structure and properties
  
  Structure and properties :
  
  | Index of refraction, $n_D$ | 1.49722 at 20 °C |
  | - | - |
  | Abbe number | ? |
  | Dielectric constant, $ε_r$ | 2.374 $ε_0$ at 20 °C |
  | Bond strength | ? |
  | Bond length | ? |
  | Bond angle | ? |
  | Magnetic susceptibility | ? |
  | Surface tension | 31.15 dyn/cm at 0 °C 28.90 dyn/cm at 20 °C 20.46 dyn/cm at 100 °C |
  | Viscosity | 0.8059 mPa·s at 0 °C 0.6200 mPa·s at 20 °C 0.4970 mPa·s at 40 °C 0.3455 mPa·s at 80 °C 0.2418 mPa·s at 130 °C |
  | Solubility | 0.203 g/L at 0 °C 0.161 g/L at 25 °C 0.22 g/L at 40 °C |
  
  ## Thermodynamic properties
  
  Phase behavior :
  
  | Triple point | 219.6 K (–53.5 °C), ? Pa |
  | - | - |
  | Critical point | 618 K (345 °C), ? Pa |
  | Std enthalpy change of fusion, $Δ_{fus}H^o$ | 11.57 kJ/mol |
  | Std entropy change of fusion, $Δ_{fus}S^o$ | 51.36 J/(mol·K) at –47.88 °C |
  | Std enthalpy change of vaporization, $Δ_{vap}H^o$ | 35.66 kJ/mol at 139.2 °C |
  | Std entropy change of vaporization, $Δ_{vap}S^o$ | ? J/(mol·K) |
  | Solid properties ||
  | Std enthalpy change of formation, $Δ_fH^o_{solid}$ | ? 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, $Δ_fH^o_{liquid}$ | –25.4 kJ/mol |
  | Standard molar entropy, $S^o_{liquid}$ | 253.80 J/(mol K) |
  | Enthalpy of combustion, $Δ_cH^o$ | –4549 kJ/mol |
  | Heat capacity, $c_p$ | 184.5 J/(mol K) at 25 °C |
  | Gas properties ||
  | Std enthalpy change of formation, $Δ_fH^o_{gas}$ | 17.2 kJ/mol |
  | Standard molar entropy, $S^o_{gas}$ | 358.2 J/(mol K) |
  | Heat capacity, $c_p$ | 125.8 J/(mol K) |
  | van der Waals' constants | a = 3076 $L^2$ $kPa/mol^2$ b = 0.1772 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 | –6.9 | 28.3 | 55.3 | 76.8 | 116.7 | 139.1 |
  
  Table data obtained from CRC Handbook of Chemistry and Physics 44th ed.
  
  ## Distillation data
  
  See also:
  
  * p-xylene (data page)
  * o-xylene (data page)
  
  Vapor-liquid Equilibrium for m-Xylene/Carbon tetrachloride P = 760 mm Hg :
  
  | BP Temp. °C | % by mole carbon tetrachloride | % by mole carbon tetrachloride |
  | - | - | - |
  | BP Temp. °C | liquid | vapor |
  | 137.0 | 1.8 | 5.8 |
  | 131.9 | 6.5 | 21.9 |
  | 126.8 | 11.4 | 35.6 |
  | 122.0 | 16.4 | 46.5 |
  | 118.1 | 20.8 | 55.2 |
  | 113.9 | 25.8 | 62.6 |
  | 110.2 | 30.6 | 68.7 |
  | 106.4 | 35.7 | 73.9 |
  | 102.8 | 41.2 | 78.8 |
  | 102.3 | 41.9 | 79.6 |
  | 98.1 | 48.8 | 84.3 |
  | 94.1 | 56.2 | 88.0 |
  | 90.6 | 63.5 | 91.1 |
  | 87.5 | 70.4 | 93.5 |
  | 84.6 | 77.5 | 95.5 |
  | 82.1 | 84.3 | 97.1 |
  | 79.7 | 91.1 | 98.4 |
  | 77.5 | 97.7 | 99.6 |
  
  Vapor-liquid Equilibrium for m-Xylene/Toluene P = 760 mm Hg :
  
  | BP Temp. °C | % by mole toluene | % by mole toluene |
  | - | - | - |
  | BP Temp. °C | liquid | vapor |
  | 133.20 | 11.1 | 35.8 |
  | 129.87 | 18.6 | 46.2 |
  | 119.68 | 52.3 | 71.8 |
  | 118.56 | 56.1 | 74.1 |
  | 117.91 | 59.3 | 76.0 |
  | 117.37 | 62.5 | 77.9 |
  | 116.32 | 67.7 | 80.2 |
  | 116.36 | 68.8 | 81.6 |
  | 115.97 | 69.8 | 82.2 |
  | 115.30 | 73.6 | 84.4 |
  
  Vapor-liquid Equilibrium for m-Xylene/Benzene P = 760 mm Hg :
  
  | BP Temp. °C | % by mole benzene | % by mole benzene |
  | - | - | - |
  | BP Temp. °C | liquid | vapor |
  | 124.80 | 10.2 | 44.7 |
  | 118.94 | 17.5 | 59.8 |
  | 115.40 | 21.4 | 65.5 |
  | 112.30 | 28.4 | 73.2 |
  | 106.35 | 34.0 | 78.0 |
  | 102.08 | 42.7 | 83.3 |
  | 99.15 | 49.4 | 86.5 |
  | 96.70 | 59.5 | 90.3 |
  | 90.89 | 68.1 | 93.0 |
  
  Vapor-liquid Equilibrium for m-Xylene/Aniline P = 745 mm Hg :
  
  | BP Temp. °C | % by mole m-xylene | % by mole m-xylene |
  | - | - | - |
  | BP Temp. °C | liquid | vapor |
  | 167 | 10.0 | 45.5 |
  | 160 | 19.5 | 58.0 |
  | 153 | 34.0 | 71.5 |
  | 146 | 53.0 | 83.0 |
  | 143 | 71.5 | 89.0 |
  | 141 | 82.0 | 93.0 |
  
  ## 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.
  