Nome: benzene*; phenyl hydride; benzol
Número CAS: 71-43-2
Massa molar: 78.11184 g
Percentual de massa: C 92.257 %; H 7.7422 %
Usos / Função
• "Manuf[acture] of industrial chemicals such as polymers, detergents, pesticides, pharmaceuticals, dyes, plastics, resins. Solvent for waxes, resins, oils, natural rubber, etc. Gasoline additive." 1
• "Benzene is an important industrial chemical, usually about 15th on the list of the top 50 chemicals produced annually in the United States. It is used as a solvent and is also the starting point for making thousands of different compound by replacing the H atoms of the ring." 2
• "By far the most important use of benzene is as a raw material in the synthesis of other organic compounds. More than 90 percent of the benzene produced in the United States is used to make ethylbenzene (55 percent), cumene (24 percent), and cyclohexane (12 percent). The first two compounds rank fifteenth and twentieth, respectively, among all chemicals produced in the United States each year. Another five percent of benzene production goes to the synthesis of a large variety of other organic compounds, including nitrobenzene, chlorobenzene, and maleic anhydride, a raw material for the manufacture of plastics. Smaller amounts of benzene are used as a solvent for cleaning purposes, in chemical reactions, and as a gasoline additive.
As with most chemicals, benzene can enter the body in one of three ways: through the skin, the nose, or the throat. People who handle or work with benzene in their workplaces are at greatest risk of exposure to benzene and should take precautions in working with the material. Because of its serious health hazards, benzene is no longer included in most materials with which the average person comes in contact. On those occasions when a person does come into contact with benzene, first aid and medical attention should be sought for the treatment of the exposure.
The health effects of exposure to liquid benzene or benzene fumes depends on the amount of benzene taken into the body. The most common symptoms of benzene exposure include irritation of the mucous membranes, convulsions, depression, and restlessness. At greater doses, a person may experience respiratory failure, followed by death. Even at low concentrations, benzene can cause long term effects for people who are regularly in contact with the compound. The most important of these effects is carcinogenic. Benzene is known to cause damage to bone marrow, resulting in a form of cancer of the blood known as leukemia." 3
Ponto de fusão:*
5.5°C 4 = 278.65 K = 41.9°F
5.5°C 5 = 278.65 K = 41.9°F
Ponto de ebulição:*
80.1°C 5 = 353.25 K = 176.18°F
80.0°C 4 = 353.15 K = 176°F
0.8765 at 20°C 4
* - 1 atm pressure
ligeiramente solúvel: 5
solúvel: • • 5
ligações duplas: 3
ligações triplas: 0
Sigma Bonds: 12
Pi Bonds: 3
Grupos carboxilo: 0
grupos hidroxilo: 0
Colagem: polar covalent
Ionic Character: 10.61 %
ΔHf° (g): 19.82 kcal/mol 6 = 82.93 kJ/mol
S° (g): 64.34 cal/(mol•K) 7 = 269.20 J/(mol•K)
ΔGf° (g): 30.99 kcal/mol 8 = 129.66 kJ/mol
CxHyOz + 0.25(4x+y-2z) O2 (g) → x CO2 (g) + 0.5y H2O (ℓ)
ΔHcomb° (ℓ): -780.955 kcal = -3267.54464 kJ
ΔHcomb° (g): -789.065 kcal = -3301.47688 kJ
Para maiores informações
French, Ind. Chemist 39, 9-12 (1963)
Thorne et al., Ind. Eng. Chem. Anal. Ed. 17, 481 (1945)
F. P. Schwartz, Anal. Chem. 52, 10 (1980)
Kimura et al., Toxicol. Appl. Pharmacol. 19, 699 (1971)
R. Snyder et al., Rev. Biochem. Toxicol. 3, 123-154 (1981)
David B. Richardson, Environ. Health Perspect. 116, 370-374 (2008)
Nadar G. Abraham, Environ. Health Perspect. 104, 1277-1282 (1996)
Lester B. Lave, Amer. Statistician 36, 260-261 (1982)
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