Chemistry belongs come the natural sciences and also studies substances, their structure, properties, chemistry compound, and their results, the laws whereby all reactions and transformations operate. Because chemistry is a science unlimited, college student have an obstacle calculating atomic mass, molecular mass, number of moles. To present how to execute the calculations quickly, we will look at the molar mass of benzene. However, the algorithm below can be applied to any type of substance.

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Benzene - What Is This Substance?


Chemical formula - C6H6

Molecular formula - C6H6

Empirical formula - CH

Molar mass is 78,11 g/mol.

Atomic weight is 78,11 g/mol.

Number that atoms: benzene is a hexagonal molecule of 6 carbon atoms and also six hydrogen atoms.

Boiling point is + - 80,1 °C.

Melting point is + - 5,5 °C.


Benzene (phenyl hydrogen) is an organic compound in one uncolored liquid through a slightly pungent sweet odor. Benzene is a hydrocarbon native a variety of the most basic arenes. The attention of benzene is toxic, carcinogenic, and contaminant.

It is generally embraced that benzene is a component of gasoline. Plenty of companies actively use it in various industrial sectors. For example, scientists develop medicinal and veterinary drugs, a wide variety of plastics, artificial rubber, dyes, etc. Return this problem is present in crude oil, that is synthesized native its other market components.

Physical properties of Benzene

Benzene is a colorless, transparent, very mobile liquid with aromatic compounds the burns with a bright smoky flame and also forms flammable vapors. In the cold, it solidifies right into a crystalline mass that melts in ~ 6 ° C.

This compound is perfectly miscible through ether, chloride, cyclohexane, ethanol, methane, octane, oxide, toluene, xylene gasoline, and other organic solvents. Benzene is virtually immiscible with water: no much more than 0.08% dissolves at 22 ° C. Benzene is an excellent solvent because that fats, resins, oils, asphalt, alkaloids, sulfur, phosphorus, iodine, etc. With some solvents, benzene forms azeotropic mixtures.

Chemical properties of Benzene

We desire to pay special attention to the chemical structure of benzene. Every of the 6 carbon atoms in the molecule is in a state the sp2 hybridization and is external inspection to two surrounding carbon atoms and also a hydrogen atom by three chemical structure -bonds. The link angles in between each pair of π-bonds room equal to 120 °. Thus, the skeleton that ð-bonds is a regular hexagon, in which every carbon atoms and also all ð-bonds C-C and H-H lie in the very same plane:

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Substitution reactions are natural in benzene. The reacts through nitrate acid, olefins, chloroalkanes, halogens, and sulfate acid. The rupture the the benzene ring is lugged out at rigid parameters that temperature and also pressure.

When connecting with olefins, building material homologous come benzene space formed, in details ethylbenzene and isopropyl benzene. Reaction through Cl2 and Br2 in the visibility of a catalyst component gives phenyl chloride. Other reactions common of this reagent encompass formylation, sulfonation, nitration, catalytic hydrogenation, oxidation, ozonolysis.

How to calculation the Molar fixed of Benzene?

It is effortless to calculation benzene molar mass. To do this, you can follow this steps:

Prepare the periodic table in advance. Friend can find this table in any type of chemical book or open up it on the Internet. With this table, you can write out the valencies of chemistry elements and the atomic mass unit.The next step is to build a chemistry formula. If you recognize what facets are had in the substance, friend can draw up a formula utilizing the routine table. In our case, the elements form the adhering to formula: C6H6.

Now it"s time to begin working v the regular table. Open up the table and write down each element"s valence - C, H. You can additionally use the valence table to leveling the task. However, it is often not in chemistry books, so friend will have to use the periodic table during the lesson.

Having composed out the valencies of every element, you can start calculating. However, prior to doing this, compose down the weight of each chemical. The weight is in the routine table. The atomic load of C is 12.0107, and H is 1.00784. The formula also includes number that need to be multiplied in addition to the mass. Friend should gain the following formulas:

Mr (C6H6) = 6 · Ar (C) + 6 · Ar (H).

Mr (C6H6) = 6 · 12 + 6 · 1 = 72 + 6 = 78. Based upon these formulas, you can see that to calculate the molar massive of ethanol, you require to add all the masses together.

You are currently close to the last step. Identify the fixed of one molecule. To perform this, you need to use the Avogadro number and also the complete molar fixed of benzene. Together a result, you can acquire the following formula:

m (C6H6) = mr (C6H6) / NA = 78 / 6,02 · 1023 = 12,9 · 1023g

It is crucial to end the job with these calculations so that the assignment look at complete.

Examples the Solving tasks with Molar mass of Benzene

In chemistry, you can discover more complex tasks using the molar fixed of benzene. Let"s take it a look at at this tasks and also examples the solutions.


Task 1

Task: Calculate the massive of benzene formed because of dehydrogenation of 184.8 g the cyclohexane.

Decision: First, we require to draw up the reaction equation - C6H14 = C6H6 + 4H2. Currently we need to find ν the cyclohexane. We division the massive by the molar mass: 184,8 / 86 = 2,15 mol.

Since the proportion of cyclohexane and also benzene in the equation is the same, climate benzene will likewise have ν same to 2,15 mol. Then we find the massive of benzene, follow to the formula. We must multiply ν by the molar mass: 2,15 · 78 = 167,7g.

Answer: The mass of benzene is 167,7 g.


Task 2

Task: What fixed of benzene (C6H6) to be chlorinated in the light if 11,35 grams of hexachlorocyclohexane (C6H6Cl6) was acquired by chlorination of benzene i m sorry is 65% yield?

Decision: Let"s compose the reaction equation because that benzene chlorination:

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Recall that the reaction product"s yield is taken as the proportion of the fixed (number the moles) that the nearly obtained problem to the mass about theory calculated utilizing the reaction equation:

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Let"s calculation the theoretical fixed of hexachlorocyclohexane (C6H6Cl6) by the formula:

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m (t) (C6H6) = 11,35 ⋅ 100/65 = 17,46 (g).

Taking right into account that the molar fixed of benzene (C6H6) and also hexachlorocyclohexane (C6H6Cl6) is 78 g/mol and 220 g/mol, respectively, we discover the fixed of benzene (C6H6) making use of the reaction equation:

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78 g of C6H6 participates in the formation of 220 g of C6H6Cl6

x g C6H6 participates in the formation of 17,46 g C6H6Cl6

From there, we get the complying with calculations:

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Consequently, 6,19 grams that benzene was chlorinated.

Answer: Chlorination the benzene weighing 6,19 grams.


How Is Benzene Mined?

The key ways to achieve pure benzene are:

coking of coal raw materials;catalytic aromatization the petroleum gas fractions;pyrolysis that oil fractions (both gasoline and also heavier);trimerization the ethine.

Where Is Benzene Used?

Currently, benzene is mainly used in the manufacturing of ethylbenzene, cumene, and cyclohexane. Based on benzene, various intermediate assets are quiet obtained, which are used in the future to get synthetic rubbers, plastics, synthetic fibers, dyes, insecticides, medicine substances, etc.

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Scientists additionally use benzene to produce some insecticides, punch agents, and also flame retardants. Civilization use benzene together a solvent and also extractant come manufacture varnishes and paints or as a highly active additive to motor fuels.