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 MSDS Search Engine, 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] n_D	1.5058 at 20°C
Abbe number	?
Dielectric constant,[2] ε_r	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, Δ_fusH^o	13.6 kJ/mol
Std entropy change of fusion, Δ_fusS^o	54.87 J/(mol·K) at −25.3
Std enthalpy change of vaporization, Δ_vapH^o	36.24 kJ/mol at 144.5°C
Std entropy change of vaporization, Δ_vapS^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	−24.4 kJ/mol
Standard molar entropy, S^o_liquid	247 J/(mol K)
Enthalpy of combustion, Δ_cH^o	−4552 kJ/mol
Heat capacity, c_p	187.0 J/(mol K) at 25°C
Gas properties
Std enthalpy change of formation, Δ_fH^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[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:

\scriptstyle \log _{e}P_{mmHg}=

\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[7]

Distillation data

See also:

BP Temp. °C	% by mole m-xylene
Vapor-liquid Equilibrium for o-Xylene/m-Xylene[8] P = 26.66 kPa
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

BP Temp. °C	% by mole carbon tetrachloride
Vapor-liquid Equilibrium for o-Xylene/Carbon tetrachloride[8] P = 760 mm Hg
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

BP Temp. °C	% by mole ethanol
Vapor-liquid Equilibrium for o-Xylene/Ethanol[8] P = 101.3 kPa
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

BP Temp. °C	% by mole Methanol
Vapor-liquid Equilibrium for o-Xylene/Methanol[8] P = 101.3 kPa
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

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References

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

"NIST Standard Reference Database".

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

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[merck-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

[lange1522-6] Lange's Handbook of Chemistry, 10th ed, pp 1522–1524

[cheric_p-7] "Pure Component Properties" (Queriable Database). Chemical Engineering Research Information Center. Retrieved 27 May 2007.

[cheric_b-8] "Binary Vapor-Liquid Equilibrium Data" (Queriable database). Chemical Engineering Research Information Center. Retrieved 27 May 2007.