Benzene (data page)

Last updated

This page provides supplementary chemical data on benzene.

Contents

Material Safety Data Sheet

The handling of this chemical may incur notable safety precautions. It is highly recommended to seek the Material Safety Datasheet (MSDS) for this chemical from a reliable source such as SIRI, and follow its directions. MSDS for benzene is available at AMOCO.

Structure and properties

Structure and properties
Refractive index, nD1.5011 at 20 °C
Abbe number ?
Dielectric constant, εr(2.274 – 0.0020ΔT) ε0
T = T – 25 °C)
Bond energy  ?
Bond length 1.39 Å C-C [1]
Molecular geometry 120 °C–C–C
120° H–C–C
Magnetic susceptibility  ?
Surface tension 28.88 dyn/cm at 25 °C
Viscosity [2]
0.7528 mPa·sat 10 °C
0.6999 mPa·sat 15 °C
0.6516 mPa·sat 20 °C
0.6076 mPa·sat 25 °C
0.5673 mPa·sat 35 °C
0.4965 mPa·sat 40 °C
0.4655 mPa·sat 45 °C
0.4370 mPa·sat 50 °C
0.4108 mPa·sat 55 °C
0.3867 mPa·sat 60 °C
0.3644 mPa·sat 65 °C
0.3439 mPa·sat 70 °C
0.3250 mPa·sat 75 °C
0.3075 mPa·sat 80 °C

Thermodynamic properties

Phase behavior
Triple point 278.5 K (5.4 °C), 4.83 kPa
Critical point 562 K (289 °C), 4.89 MPa
Std enthalpy change
of fusion
, ΔfusHo
9.9 kJ/mol at 5.42 °C
Std entropy change
of fusion
, ΔfusSo
35.5 J/(mol·K) at 5.42 °C
Std enthalpy change
of vaporization
, ΔvapHo
33.9 kJ/mol at 25 °C
30.77 kJ/mol at 80.1 °C
Std entropy change
of vaporization
, ΔvapSo
113.6 J/(mol·K) at 25 °C
87.1 J/(mol·K) at 80.1 °C
Solid properties
Std enthalpy change
of formation
, ΔfHosolid
 ? kJ/mol
Standard molar entropy,
Sosolid
45.56 J/(mol K)
Heat capacity, cp118.4 J/(mol K) at 0 °C
Liquid properties
Std enthalpy change
of formation
, ΔfHoliquid
+48.7 kJ/mol
Standard molar entropy,
Soliquid
173.26 J/(mol K)
Enthalpy of combustion, ΔcHo–3273 kJ/mol
Heat capacity, [2] cp134.8 J/(mol K)
Gas properties
Std enthalpy change
of formation
, ΔfHogas
+82.93 kJ/mol
Standard molar entropy, [3]
Sogas
269.01 J/(mol K)
Heat capacity, [2] cp82.44 J/(mol K) at 25 °C
van der Waals' constants [4] a = 1823.9 L2 kPa/mol2
b = 0.1154 liter per mole

Vapor pressure of liquid

P in mm Hg11040100400760152038007600152003040045600
T in °C–36.7(s)–11.5(s)7.626.160.680.1103.8142.5178.8221.5272.3 

Table data obtained from CRC Handbook of Chemistry and Physics 44th ed. Note: (s) notation indicates equilibrium temperature of vapor over solid, otherwise value is equilibrium temperature of vapor over liquid.

log of Benzene vapor pressure. Uses formula:
log
e
[?]
P
m
m
H
g
=
{\displaystyle \scriptstyle \log _{e}P_{mmHg}=}
log
e
[?]
(
760
101.325
)
-
8.433613
log
e
[?]
(
T
+
273.15
)
-
6281.040
T
+
273.15
+
71.10718
+
6.198413
x
10
-
06
(
T
+
273.15
)
2
{\displaystyle \scriptstyle \log _{e}({\frac {760}{101.325}})-8.433613\log _{e}(T+273.15)-{\frac {6281.040}{T+273.15}}+71.10718+6.198413\times 10^{-06}(T+273.15)^{2}}
obtained from CHERIC Note: yellow area is the region where the formula disagrees with tabulated data above. LogBenzeneVaporPressure.png
log of Benzene vapor pressure. Uses formula: obtained from CHERIC Note: yellow area is the region where the formula disagrees with tabulated data above.

Distillation data

Vapor-liquid Equilibrium
for Benzene/Ethanol
[5]
P = 760 mm Hg
BP
Temp.
°C
 % by mole ethanol
liquidvapor
70.88.626.5
69.811.228.2
69.612.030.8
69.115.833.5
68.520.036.8
67.730.841.0
67.744.244.6
68.160.450.5
69.677.059.0
70.481.562.8
70.984.166.5
72.789.874.4
73.892.478.2
  
Vapor-liquid Equilibrium
for Benzene/Methanol
[5]
P = 760 mm Hg
BP
Temp.
°C
 % by mole methanol
liquidvapor
70.672.626.7
66.445.037.1
62.878.845.7
60.2016.452.6
58.6433.355.9
58.0254.959.5
58.1069.963.3
58.4778.266.5
59.9089.876.0
62.7197.390.7
  
Vapor-liquid Equilibrium
for Benzene/Acetone
[5]
P = 101.325 kPa
BP
Temp.
°C
 % by mole benzene
liquidvapor
57.3411.77.4
57.4812.88.1
57.7515.19.5
59.2126.716.6
59.2427.016.7
60.0132.720.2
60.7137.323.1
61.0539.824.7
61.9145.027.9
62.8250.231.7
63.3953.433.9
63.7955.435.3
64.2257.237.0
64.9961.339.9
67.8873.051.2
70.2180.760.1
72.2386.167.9
  
Vapor-liquid Equilibrium
for Benzene/n-Hexane
[5]
P = 760 mmHg
BP
Temp.
°C
 % by mole hexane
liquidvapor
77.67.314.0
75.117.226.8
73.426.837.6
72.037.246.0
70.946.254.0
70.058.564.4
69.469.272.5
69.179.280.7
69.082.883.8
68.988.388.8
68.894.795.0
68.896.296.4

Spectral data

UV-Vis
Ionization potential 9.24 eV (74525.6 cm−1)
S1 4.75 eV (38311.3 cm−1)
S2 6.05 eV (48796.5 cm−1)
λmax 255 nm
Extinction coefficient, ε ?
IR
Major absorption bands [6]
(liquid film)
Wave numbertransmittance
3091 cm142%
3072 cm149%
3036 cm127%
1961 cm177%
1815 cm170%
1526 cm181%
1479 cm120%
1393 cm184%
1176 cm186%
1038 cm149%
674 cm14%
NMR
Proton NMR (CDCl3, 300 MHz) δ 7.34 (s, 6H)
Carbon-13 NMR (CDCl3, 25 MHz) δ 128.4
Other NMR data 
MS
Masses of
main fragments
 

Benzene h nmr.png Benzene c13 nmr.png

Safety data

Material Safety Data Sheet for benzene:

Common synonymsNone
Physical propertiesForm: colorless liquid
Stability: Stable, but very flammable
Melting point: 5.5 C
Water solubility: negligible
Specific gravity: 0.87
Principal hazards*** Benzene is a carcinogen (cancer-causing agent).
*** Very flammable. The pure material, and any solutions containing it, constitute a fire risk.
Safe handlingBenzene should NOT be used at all unless no safer alternatives are available.
If benzene must be used in an experiment, it should be handled at all stages in a fume cupboard.
Wear safety glasses and use protective gloves.
EmergencyEye contact: Immediately flush the eye with plenty of water. Continue for at least ten minutes
and call for immediate medical help.
Skin contact: Wash off with soap and water. Remove any contaminated clothing. If the skin
reddens or appears damaged, call for medical aid.
If swallowed: Call for immediate medical help.
DisposalIt is dangerous to try to dispose of benzene by washing it down a sink, since it is toxic, will cause environmental damage
and presents a fire risk. It is probable that trying to dispose of benzene in this way will also break local
environmental rules. Instead, retain in a safe place in the laboratory (well away from any source of ignition)
for disposal with other flammable, non-chlorinated solvents.
Protective equipmentSafety glasses. If gloves are worn, PVA, butyl rubber and viton are suitable materials.

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References

  1. Brown; LeMay; Bursten (2006). Chemistry: The Central Science . Upper Saddle River, NJ: Pearson Education. pp.  1067. ISBN   0-13-109686-9.
  2. 1 2 3 4 "Pure Component Properties" (Queriable database). Chemical Engineering Research Information Center. Retrieved 12 May 2007.
  3. "ETP Entropy of Benzene" (Queriable database). Dortmund Data Bank. Retrieved 7 October 2011.
  4. Lange's Handbook of Chemistry 10th ed, pp. 1522–1524
  5. 1 2 3 4 "Binary Vapor-Liquid Equilibrium Data" (Queriable database). Chemical Engineering Research Information Center. Retrieved 12 May 2007.
  6. "Spectral Database for Organic Compounds". Advanced Industrial Science and Technology. Archived from the original (Queriable database) on 5 May 2006. Retrieved 10 June 2007.
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